| Message ID | 1359480184-9168-3-git-send-email-robdclark@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 01/29/2013 06:23 PM, Rob Clark wrote: > Driver for the NXP TDA998X i2c hdmi encoder slave. Rob, good to see a driver for TDA998x comming! I'd love to test it on CuBox (mach-dove) but there is no gpu driver I can hook up, yet. Anyway, I will make some comments how I think the driver should be improved. > diff --git a/drivers/gpu/drm/i2c/Kconfig b/drivers/gpu/drm/i2c/Kconfig > index 1611836..4d341db 100644 > --- a/drivers/gpu/drm/i2c/Kconfig > +++ b/drivers/gpu/drm/i2c/Kconfig > @@ -19,4 +19,10 @@ config DRM_I2C_SIL164 > when used in pairs) TMDS transmitters, used in some nVidia > video cards. > > +config DRM_I2C_NXP_TDA998X > + tristate "NXP Semiconductors TDA998X HDMI encoder" > + default m if DRM_TILCDC > + help > + Support for NXP Semiconductors TDA998X HDMI encoders. Maybe nit-picking but later down you actually support TDA9989, TDA19988, and TDA19989. The latter ones don't fit in TDA998x, so at least the Kconfig entry should reflect TDA9989/TDA1998x. > [...] > diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c > new file mode 100644 > index 0000000..e68b58a > --- /dev/null > +++ b/drivers/gpu/drm/i2c/tda998x_drv.c > @@ -0,0 +1,906 @@ > +/* > + * Copyright (C) 2012 Texas Instruments > + * Author: Rob Clark<robdclark@gmail.com> > + * > + > [...] > + > +/* The TDA9988 series of devices use a paged register scheme.. to simplify > + * things we encode the page # in upper bits of the register #. To read/ > + * write a given register, we need to make sure CURPAGE register is set > + * appropriately. Which implies reads/writes are not atomic. Fun! > + */ Please have a look at regmap-i2c, it also supports paged i2c registers and will save you _a lot_ of the i2c handling. > [...] > + > +/* Device versions: */ > +#define TDA9989N2 0x0101 > +#define TDA19989 0x0201 > +#define TDA19989N2 0x0202 > +#define TDA19988 0x0301 Maybe split this into device_version/revision? What does N2 stand for or is this the name NXP uses for that device? > [...] > +static void > +cec_write(struct drm_encoder *encoder, uint16_t addr, uint8_t val) > +{ > + struct i2c_client *client = to_tda998x_priv(encoder)->cec; > + uint8_t buf[] = {addr, val}; > + int ret; > + > + ret = i2c_master_send(client, buf, ARRAY_SIZE(buf)); > + if (ret< 0) > + dev_err(&client->dev, "Error %d writing to cec:0x%x\n", ret, addr); > +} Has there been any decision on how to split/integrate cec from drm? Or is there display stuff located in cec i2c slave (I see HPD in ..._detect below)? > [...] > +static void > +tda998x_encoder_save(struct drm_encoder *encoder) > +{ > + DBG(""); > +} > + > +static void > +tda998x_encoder_restore(struct drm_encoder *encoder) > +{ > + DBG(""); > +} Hmmm, these DBG("") shouldn't be in upstream kernel code? > +static bool > +tda998x_encoder_mode_fixup(struct drm_encoder *encoder, > + const struct drm_display_mode *mode, > + struct drm_display_mode *adjusted_mode) > +{ > + return true; > +} > + > +static int > +tda998x_encoder_mode_valid(struct drm_encoder *encoder, > + struct drm_display_mode *mode) > +{ > + return MODE_OK; > +} At least a note would be helpful to see what callbacks are not yet done. I guess there will be some kind of mode check someday? > [...] > +static enum drm_connector_status > +tda998x_encoder_detect(struct drm_encoder *encoder, > + struct drm_connector *connector) > +{ > + uint8_t val = cec_read(encoder, REG_CEC_RXSHPDLEV); > + return (val& CEC_RXSHPDLEV_HPD) ? connector_status_connected : > + connector_status_disconnected; > +} This is where cec slave gets called from hdmi i2c driver. Any chance there is HPD status in hdmi registers, too? > +/* I2C driver functions */ > + > +static int > +tda998x_probe(struct i2c_client *client, const struct i2c_device_id *id) > +{ > + return 0; > +} > + > +static int > +tda998x_remove(struct i2c_client *client) > +{ > + return 0; > +} Hmm, empty _probe and _remove? Maybe these should get some code from _init below? > +static int > +tda998x_encoder_init(struct i2c_client *client, > + struct drm_device *dev, > + struct drm_encoder_slave *encoder_slave) > +{ > + struct drm_encoder *encoder =&encoder_slave->base; > + struct tda998x_priv *priv; > + > + priv = kzalloc(sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + priv->current_page = 0; > + priv->cec = i2c_new_dummy(client->adapter, 0x34); > + priv->dpms = DRM_MODE_DPMS_OFF; > + > + encoder_slave->slave_priv = priv; > + encoder_slave->slave_funcs =&tda998x_encoder_funcs; > + > + /* wake up the device: */ > + cec_write(encoder, REG_CEC_ENAMODS, > + CEC_ENAMODS_EN_RXSENS | CEC_ENAMODS_EN_HDMI); > + > + tda998x_reset(encoder); > + > + /* read version: */ > + priv->rev = reg_read(encoder, REG_VERSION_LSB) | > + reg_read(encoder, REG_VERSION_MSB)<< 8; > + > + /* mask off feature bits: */ > + priv->rev&= ~0x30; /* not-hdcp and not-scalar bit */ If revision register contains features, why not save them for later driver improvements? > + switch (priv->rev) { > + case TDA9989N2: dev_info(dev->dev, "found TDA9989 n2"); break; > + case TDA19989: dev_info(dev->dev, "found TDA19989"); break; > + case TDA19989N2: dev_info(dev->dev, "found TDA19989 n2"); break; > + case TDA19988: dev_info(dev->dev, "found TDA19988"); break; > + default: > + DBG("found unsupported device: %04x", priv->rev); > + goto fail; > + } I think printing revision is sufficient, no user will care about the actual device or revision. > + /* after reset, enable DDC: */ > + reg_write(encoder, REG_DDC_DISABLE, 0x00); > + > + /* set clock on DDC channel: */ > + reg_write(encoder, REG_TX3, 39); This should be kept disabled as long as there is no monitor attached (HPD!) > + /* if necessary, disable multi-master: */ > + if (priv->rev == TDA19989) > + reg_set(encoder, REG_I2C_MASTER, I2C_MASTER_DIS_MM); > + > + cec_write(encoder, REG_CEC_FRO_IM_CLK_CTRL, > + CEC_FRO_IM_CLK_CTRL_GHOST_DIS | CEC_FRO_IM_CLK_CTRL_IMCLK_SEL); > + > + return 0; > + > +fail: > + /* if encoder_init fails, the encoder slave is never registered, > + * so cleanup here: > + */ > + if (priv->cec) > + i2c_unregister_device(priv->cec); > + kfree(priv); > + encoder_slave->slave_priv = NULL; > + encoder_slave->slave_funcs = NULL; > + return -ENXIO; > +} > + > +static struct i2c_device_id tda998x_ids[] = { > + { "tda998x", 0 }, > + { } > +}; > +MODULE_DEVICE_TABLE(i2c, tda998x_ids); Shouldn't the above carry the hdmi core i2c address at least? > +static struct drm_i2c_encoder_driver tda998x_driver = { > + .i2c_driver = { > + .probe = tda998x_probe, > + .remove = tda998x_remove, > + .driver = { > + .name = "tda998x", > + }, > + .id_table = tda998x_ids, > + }, > + .encoder_init = tda998x_encoder_init, > +}; > + > +/* Module initialization */ > + > +static int __init > +tda998x_init(void) > +{ > + DBG(""); > + return drm_i2c_encoder_register(THIS_MODULE,&tda998x_driver); > +} > + > +static void __exit > +tda998x_exit(void) > +{ > + DBG(""); > + drm_i2c_encoder_unregister(&tda998x_driver); > +} > + > +MODULE_AUTHOR("Rob Clark<robdclark@gmail.com"); > +MODULE_DESCRIPTION("NXP Semiconductors TDA998X HDMI Encoder"); > +MODULE_LICENSE("GPL"); Maybe stick to one version of "TDA998X" or "TDA998x" ? Regards, Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, Jan 30, 2013 at 8:23 PM, Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> wrote: > On 01/29/2013 06:23 PM, Rob Clark wrote: >> >> Driver for the NXP TDA998X i2c hdmi encoder slave. > > > Rob, > > good to see a driver for TDA998x comming! I'd love to test > it on CuBox (mach-dove) but there is no gpu driver I can hook up, > yet. Anyway, I will make some comments how I think the driver > should be improved. > > >> diff --git a/drivers/gpu/drm/i2c/Kconfig b/drivers/gpu/drm/i2c/Kconfig >> index 1611836..4d341db 100644 >> --- a/drivers/gpu/drm/i2c/Kconfig >> +++ b/drivers/gpu/drm/i2c/Kconfig >> @@ -19,4 +19,10 @@ config DRM_I2C_SIL164 >> when used in pairs) TMDS transmitters, used in some nVidia >> video cards. >> >> +config DRM_I2C_NXP_TDA998X >> + tristate "NXP Semiconductors TDA998X HDMI encoder" >> + default m if DRM_TILCDC >> + help >> + Support for NXP Semiconductors TDA998X HDMI encoders. > > > Maybe nit-picking but later down you actually support TDA9989, > TDA19988, and TDA19989. The latter ones don't fit in TDA998x, > so at least the Kconfig entry should reflect TDA9989/TDA1998x. yeah, it is a bit weird naming scheme, but I'm just copying NXP in referring to the whole family as TDA998x >> [...] >> >> diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c >> b/drivers/gpu/drm/i2c/tda998x_drv.c >> new file mode 100644 >> index 0000000..e68b58a >> --- /dev/null >> +++ b/drivers/gpu/drm/i2c/tda998x_drv.c >> @@ -0,0 +1,906 @@ >> +/* >> + * Copyright (C) 2012 Texas Instruments >> + * Author: Rob Clark<robdclark@gmail.com> >> + * >> + >> [...] >> >> + >> +/* The TDA9988 series of devices use a paged register scheme.. to >> simplify >> + * things we encode the page # in upper bits of the register #. To read/ >> + * write a given register, we need to make sure CURPAGE register is set >> + * appropriately. Which implies reads/writes are not atomic. Fun! >> + */ > > > Please have a look at regmap-i2c, it also supports paged i2c registers > and will save you _a lot_ of the i2c handling. Yeah, I have looked at it, and will eventually convert over to using it. The problems at the moment are that I don't really have enough documentation about the chip at the register level to properly use the caching modes, and from my digging through the regmap code it looked like paged regmap + non-caching will result in writes to the page register for every transaction. That, and a bit of docs or few more examples of using the paging support in regmap would be nice. For now, I am punting on regmap conversion. >> [...] >> >> + >> +/* Device versions: */ >> +#define TDA9989N2 0x0101 >> +#define TDA19989 0x0201 >> +#define TDA19989N2 0x0202 >> +#define TDA19988 0x0301 > > > Maybe split this into device_version/revision? What does N2 stand for > or is this the name NXP uses for that device? The register names are based on the names used in the NXP out-of-tree driver (the 50kloc monstrosity, if you've seen it).. that was pretty much all the register level documentation I had. >> [...] > >> +static void >> +cec_write(struct drm_encoder *encoder, uint16_t addr, uint8_t val) >> +{ >> + struct i2c_client *client = to_tda998x_priv(encoder)->cec; >> + uint8_t buf[] = {addr, val}; >> + int ret; >> + >> + ret = i2c_master_send(client, buf, ARRAY_SIZE(buf)); >> + if (ret< 0) >> + dev_err(&client->dev, "Error %d writing to cec:0x%x\n", >> ret, addr); >> +} > > > Has there been any decision on how to split/integrate cec from drm? > Or is there display stuff located in cec i2c slave (I see HPD in > ..._detect below)? not sure, but at least in this case it can't really be decoupled. I need to use the CEC interface for HPD (as you noticed) and also to power up the HDMI bits.. >> [...] >> >> +static void >> +tda998x_encoder_save(struct drm_encoder *encoder) >> +{ >> + DBG(""); >> +} >> + >> +static void >> +tda998x_encoder_restore(struct drm_encoder *encoder) >> +{ >> + DBG(""); >> +} > > > Hmmm, these DBG("") shouldn't be in upstream kernel code? > yeah, I suppose these traces don't add too much value, I can remove them >> +static bool >> +tda998x_encoder_mode_fixup(struct drm_encoder *encoder, >> + const struct drm_display_mode *mode, >> + struct drm_display_mode *adjusted_mode) >> +{ >> + return true; >> +} >> + >> +static int >> +tda998x_encoder_mode_valid(struct drm_encoder *encoder, >> + struct drm_display_mode *mode) >> +{ >> + return MODE_OK; >> +} > > > At least a note would be helpful to see what callbacks are > not yet done. I guess there will be some kind of mode check > someday? Well, some of these drm will assume the fxn ptrs are not null, so we need something even if it is empty. I suppose there are must be some upper bounds on pixel clock supported, which could perhaps be added some day in _mode_valid(). On the device I am working on, the limiting factor is the crtc (upstream of the encoder), so I haven't really needed this yet. I expect that as people start using this on some other devices, we'll come across some enhancements needed, some places where we need to add some configuration, etc. I cannot really predict exactly what is needed, so I prefer just to put the driver out there in some form, and then add it it as needed. So, I wouldn't really say that these functions are "TODO", but I also wouldn't say that we won't find some reason to add some code there at some point. >> [...] >> >> +static enum drm_connector_status >> +tda998x_encoder_detect(struct drm_encoder *encoder, >> + struct drm_connector *connector) >> +{ >> + uint8_t val = cec_read(encoder, REG_CEC_RXSHPDLEV); >> + return (val& CEC_RXSHPDLEV_HPD) ? connector_status_connected : >> + connector_status_disconnected; >> +} > > > This is where cec slave gets called from hdmi i2c driver. Any chance > there is HPD status in hdmi registers, too? Not that I know of. But like I mentioned, we also need to use the CEC interface just to talk to the HDMI interface. Before setting ENAMODS reg via cec address, the hdmi address won't even show up (for ex, on i2cdetect). Maybe there is some way that this code should register some interface with CEC driver/subsystem? (Is there such a thing? I am not really CEC expert.) But I don't think there is any way to completely split it out. > >> +/* I2C driver functions */ >> + >> +static int >> +tda998x_probe(struct i2c_client *client, const struct i2c_device_id *id) >> +{ >> + return 0; >> +} >> + >> +static int >> +tda998x_remove(struct i2c_client *client) >> +{ >> + return 0; >> +} > > > Hmm, empty _probe and _remove? Maybe these should get some code > from _init below? naw, they aren't really used for drm i2c encoder slaves. >> +static int >> +tda998x_encoder_init(struct i2c_client *client, >> + struct drm_device *dev, >> + struct drm_encoder_slave *encoder_slave) >> +{ >> + struct drm_encoder *encoder =&encoder_slave->base; >> >> + struct tda998x_priv *priv; >> + >> + priv = kzalloc(sizeof(*priv), GFP_KERNEL); >> + if (!priv) >> + return -ENOMEM; >> + >> + priv->current_page = 0; >> + priv->cec = i2c_new_dummy(client->adapter, 0x34); >> + priv->dpms = DRM_MODE_DPMS_OFF; >> + >> + encoder_slave->slave_priv = priv; >> + encoder_slave->slave_funcs =&tda998x_encoder_funcs; >> + >> + /* wake up the device: */ >> + cec_write(encoder, REG_CEC_ENAMODS, >> + CEC_ENAMODS_EN_RXSENS | CEC_ENAMODS_EN_HDMI); >> + >> + tda998x_reset(encoder); >> + >> + /* read version: */ >> + priv->rev = reg_read(encoder, REG_VERSION_LSB) | >> + reg_read(encoder, REG_VERSION_MSB)<< 8; >> + >> + /* mask off feature bits: */ >> + priv->rev &= ~0x30; /* not-hdcp and not-scalar bit */ > > > If revision register contains features, why not save them for later > driver improvements? > can be added later if the need arises. I prefer to leave out code that only might be used later.. otherwise it is a good way to accumulate cruft. > >> + switch (priv->rev) { >> + case TDA9989N2: dev_info(dev->dev, "found TDA9989 n2"); break; >> + case TDA19989: dev_info(dev->dev, "found TDA19989"); break; >> + case TDA19989N2: dev_info(dev->dev, "found TDA19989 n2"); break; >> + case TDA19988: dev_info(dev->dev, "found TDA19988"); break; >> + default: >> + DBG("found unsupported device: %04x", priv->rev); >> + goto fail; >> + } > > > I think printing revision is sufficient, no user will care about the > actual device or revision. > > >> + /* after reset, enable DDC: */ >> + reg_write(encoder, REG_DDC_DISABLE, 0x00); >> + >> + /* set clock on DDC channel: */ >> + reg_write(encoder, REG_TX3, 39); > > > This should be kept disabled as long as there is no monitor attached > (HPD!) > The sequence is based on NXP's driver.. I'll have to go back and check, but IIRC there were a few things I had to turn on just to make HPD work in the first place. Ofc, if there were actually some decent docs about the part, it would be a bit easier to know what is actually required and what is not. So I don't claim everything in it's current form is optimal. > >> + /* if necessary, disable multi-master: */ >> + if (priv->rev == TDA19989) >> + reg_set(encoder, REG_I2C_MASTER, I2C_MASTER_DIS_MM); >> + >> + cec_write(encoder, REG_CEC_FRO_IM_CLK_CTRL, >> + CEC_FRO_IM_CLK_CTRL_GHOST_DIS | >> CEC_FRO_IM_CLK_CTRL_IMCLK_SEL); >> + >> + return 0; >> + >> +fail: >> + /* if encoder_init fails, the encoder slave is never registered, >> + * so cleanup here: >> + */ >> + if (priv->cec) >> + i2c_unregister_device(priv->cec); >> + kfree(priv); >> + encoder_slave->slave_priv = NULL; >> + encoder_slave->slave_funcs = NULL; >> + return -ENXIO; >> +} >> + >> +static struct i2c_device_id tda998x_ids[] = { >> + { "tda998x", 0 }, >> + { } >> +}; >> +MODULE_DEVICE_TABLE(i2c, tda998x_ids); > > > Shouldn't the above carry the hdmi core i2c address at least? > no, it should come from the user of the encoder slave. Actually the CEC address should too, but current drm i2c encoder slave code sort of assumes the device just has a single address BR, -R > >> +static struct drm_i2c_encoder_driver tda998x_driver = { >> + .i2c_driver = { >> + .probe = tda998x_probe, >> + .remove = tda998x_remove, >> + .driver = { >> + .name = "tda998x", >> + }, >> + .id_table = tda998x_ids, >> + }, >> + .encoder_init = tda998x_encoder_init, >> +}; >> + >> +/* Module initialization */ >> + >> +static int __init >> +tda998x_init(void) >> +{ >> + DBG(""); >> + return drm_i2c_encoder_register(THIS_MODULE,&tda998x_driver); >> +} >> + >> +static void __exit >> +tda998x_exit(void) >> +{ >> + DBG(""); >> + drm_i2c_encoder_unregister(&tda998x_driver); >> +} >> + >> +MODULE_AUTHOR("Rob Clark<robdclark@gmail.com"); >> +MODULE_DESCRIPTION("NXP Semiconductors TDA998X HDMI Encoder"); >> +MODULE_LICENSE("GPL"); > > > Maybe stick to one version of "TDA998X" or "TDA998x" ? > > Regards, > Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Thu, Jan 31, 2013 at 08:23:53AM -0600, Rob Clark wrote: > On Wed, Jan 30, 2013 at 8:23 PM, Sebastian Hesselbarth > <sebastian.hesselbarth@gmail.com> wrote: > > On 01/29/2013 06:23 PM, Rob Clark wrote: > >> > >> Driver for the NXP TDA998X i2c hdmi encoder slave. > > > > > > Rob, > > > > good to see a driver for TDA998x comming! I'd love to test > > it on CuBox (mach-dove) but there is no gpu driver I can hook up, > > yet. Anyway, I will make some comments how I think the driver > > should be improved. I will eventually pick this up and give it a whirl with my cubox DRM stuff. I've yet to receive my round tuit. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 01/31/2013 03:23 PM, Rob Clark wrote: > On Wed, Jan 30, 2013 at 8:23 PM, Sebastian Hesselbarth > <sebastian.hesselbarth@gmail.com> wrote: >> On 01/29/2013 06:23 PM, Rob Clark wrote: [...] >>> + >>> +/* The TDA9988 series of devices use a paged register scheme.. to >>> simplify >>> + * things we encode the page # in upper bits of the register #. To read/ >>> + * write a given register, we need to make sure CURPAGE register is set >>> + * appropriately. Which implies reads/writes are not atomic. Fun! >>> + */ >> >> Please have a look at regmap-i2c, it also supports paged i2c registers >> and will save you _a lot_ of the i2c handling. > > Yeah, I have looked at it, and will eventually convert over to using > it. The problems at the moment are that I don't really have enough > documentation about the chip at the register level to properly use the > caching modes, and from my digging through the regmap code it looked > like paged regmap + non-caching will result in writes to the page > register for every transaction. That, and a bit of docs or few more > examples of using the paging support in regmap would be nice. For > now, I am punting on regmap conversion. Hmm, flipping through the public tda998x sources *sigh* I found a quite complete register list that also states if registers are RO or RW. Even if you are not using all registers you can still prevent regmap from reading/writing to them. But yes, documentation lacks some examples ;) >>> [...] >>> + >>> +/* Device versions: */ >>> +#define TDA9989N2 0x0101 >>> +#define TDA19989 0x0201 >>> +#define TDA19989N2 0x0202 >>> +#define TDA19988 0x0301 >> >> >> Maybe split this into device_version/revision? What does N2 stand for >> or is this the name NXP uses for that device? > > The register names are based on the names used in the NXP out-of-tree > driver (the 50kloc monstrosity, if you've seen it).. that was pretty > much all the register level documentation I had. Yeah, but there is a comment about N2, that says the last bit is "not a register bit, but is derived by the driver from the new N5 registers..". I guess you will not see that many i2c devices returning you "N2" version registers.. >>> [...] >> >>> +static void >>> +cec_write(struct drm_encoder *encoder, uint16_t addr, uint8_t val) >>> +{ >>> + struct i2c_client *client = to_tda998x_priv(encoder)->cec; >>> + uint8_t buf[] = {addr, val}; >>> + int ret; >>> + >>> + ret = i2c_master_send(client, buf, ARRAY_SIZE(buf)); >>> + if (ret< 0) >>> + dev_err(&client->dev, "Error %d writing to cec:0x%x\n", >>> ret, addr); >>> +} >> >> >> Has there been any decision on how to split/integrate cec from drm? >> Or is there display stuff located in cec i2c slave (I see HPD in >> ..._detect below)? > > not sure, but at least in this case it can't really be decoupled. I > need to use the CEC interface for HPD (as you noticed) and also to > power up the HDMI bits.. Just to make things clearer here, TDA998x ususally has two i2c slaves at power-up, 0x70 (hdmi slave) and 0x34 (cec slave). Are you actually accessing the cec slave? [...] >>> +static bool >>> +tda998x_encoder_mode_fixup(struct drm_encoder *encoder, >>> + const struct drm_display_mode *mode, >>> + struct drm_display_mode *adjusted_mode) >>> +{ >>> + return true; >>> +} >>> + >>> +static int >>> +tda998x_encoder_mode_valid(struct drm_encoder *encoder, >>> + struct drm_display_mode *mode) >>> +{ >>> + return MODE_OK; >>> +} >> >> >> At least a note would be helpful to see what callbacks are >> not yet done. I guess there will be some kind of mode check >> someday? > > Well, some of these drm will assume the fxn ptrs are not null, so we > need something even if it is empty. > > I suppose there are must be some upper bounds on pixel clock > supported, which could perhaps be added some day in _mode_valid(). On Depends what drm expects on mode_valid or mode_fixup, I haven't dug into drm encoders, yet. But usually for HDMI/DVI you will only choose between modes supplied by monitor EDID and not choose something "close". Anyway, I just think a note about stuff that is not yet working is helpful. > the device I am working on, the limiting factor is the crtc (upstream > of the encoder), so I haven't really needed this yet. I expect that > as people start using this on some other devices, we'll come across > some enhancements needed, some places where we need to add some > configuration, etc. I cannot really predict exactly what is needed, > so I prefer just to put the driver out there in some form, and then > add it it as needed. So, I wouldn't really say that these functions > are "TODO", but I also wouldn't say that we won't find some reason to > add some code there at some point. Or put it in staging? >>> [...] >>> >>> +static enum drm_connector_status >>> +tda998x_encoder_detect(struct drm_encoder *encoder, >>> + struct drm_connector *connector) >>> +{ >>> + uint8_t val = cec_read(encoder, REG_CEC_RXSHPDLEV); >>> + return (val& CEC_RXSHPDLEV_HPD) ? connector_status_connected : >>> + connector_status_disconnected; >>> +} >> >> >> This is where cec slave gets called from hdmi i2c driver. Any chance >> there is HPD status in hdmi registers, too? > > Not that I know of. But like I mentioned, we also need to use the CEC > interface just to talk to the HDMI interface. Before setting ENAMODS > reg via cec address, the hdmi address won't even show up (for ex, on > i2cdetect). Again, I quickly checked the public sources. The cec slave looks like is only for cec communication, i.e. actually sending/receiving messages. But from your patch it isn't even clear to me, when you access hdmi or cec slave as you are bypassing i2c client subsystem somehow. > Maybe there is some way that this code should register some interface > with CEC driver/subsystem? (Is there such a thing? I am not really > CEC expert.) But I don't think there is any way to completely split > it out. When speaking about CEC subsystem you mean sending/receiving cec messages and the corresponding kernel API? That can come later, for now everything this driver needs can IMHO depend on EDID, i.e. DVI-style, only. CEC communication can come later. >>> +/* I2C driver functions */ >>> + >>> +static int >>> +tda998x_probe(struct i2c_client *client, const struct i2c_device_id *id) >>> +{ >>> + return 0; >>> +} >>> + >>> +static int >>> +tda998x_remove(struct i2c_client *client) >>> +{ >>> + return 0; >>> +} >> >> >> Hmm, empty _probe and _remove? Maybe these should get some code >> from _init below? > > naw, they aren't really used for drm i2c encoder slaves. Well, if you use a i2c_client_addr != 0 below, the i2c subsystem will only bother you if it finds e.g. device 0x70 on an i2c bus. So they should be used. The drm API must be clear about what should happen in encoder_init and encoder_probe. >>> +static int >>> +tda998x_encoder_init(struct i2c_client *client, >>> + struct drm_device *dev, >>> + struct drm_encoder_slave *encoder_slave) >>> +{ >>> + struct drm_encoder *encoder =&encoder_slave->base; >>> >>> + struct tda998x_priv *priv; >>> + >>> + priv = kzalloc(sizeof(*priv), GFP_KERNEL); >>> + if (!priv) >>> + return -ENOMEM; >>> + >>> + priv->current_page = 0; >>> + priv->cec = i2c_new_dummy(client->adapter, 0x34); >>> + priv->dpms = DRM_MODE_DPMS_OFF; >>> + >>> + encoder_slave->slave_priv = priv; >>> + encoder_slave->slave_funcs =&tda998x_encoder_funcs; >>> + >>> + /* wake up the device: */ >>> + cec_write(encoder, REG_CEC_ENAMODS, >>> + CEC_ENAMODS_EN_RXSENS | CEC_ENAMODS_EN_HDMI); >>> + >>> + tda998x_reset(encoder); >>> + >>> + /* read version: */ >>> + priv->rev = reg_read(encoder, REG_VERSION_LSB) | >>> + reg_read(encoder, REG_VERSION_MSB)<< 8; >>> + >>> + /* mask off feature bits: */ >>> + priv->rev&= ~0x30; /* not-hdcp and not-scalar bit */ >> >> >> If revision register contains features, why not save them for later >> driver improvements? >> > > can be added later if the need arises. I prefer to leave out code > that only might be used later.. otherwise it is a good way to > accumulate cruft. True, but magic masking (~0x30) and some comments don't help either. >> >>> + switch (priv->rev) { >>> + case TDA9989N2: dev_info(dev->dev, "found TDA9989 n2"); break; >>> + case TDA19989: dev_info(dev->dev, "found TDA19989"); break; >>> + case TDA19989N2: dev_info(dev->dev, "found TDA19989 n2"); break; >>> + case TDA19988: dev_info(dev->dev, "found TDA19988"); break; >>> + default: >>> + DBG("found unsupported device: %04x", priv->rev); >>> + goto fail; >>> + } >> >> >> I think printing revision is sufficient, no user will care about the >> actual device or revision. >> >> >>> + /* after reset, enable DDC: */ >>> + reg_write(encoder, REG_DDC_DISABLE, 0x00); >>> + >>> + /* set clock on DDC channel: */ >>> + reg_write(encoder, REG_TX3, 39); >> >> >> This should be kept disabled as long as there is no monitor attached >> (HPD!) >> > > The sequence is based on NXP's driver.. I'll have to go back and > check, but IIRC there were a few things I had to turn on just to make > HPD work in the first place. Hmm, I have seen a note about issues with some monitors that expect ddc clock to be stable very early. And this looks like the NXP proposed workaround to always clock ddc - but it tells nothing about the reason and more important the note from NXP clearly puts some restrictions on how hdmi tx needs to be clocked by pixclk. Can you ensure a stable pixclk at this point at all? > Ofc, if there were actually some decent docs about the part, it would > be a bit easier to know what is actually required and what is not. So > I don't claim everything in it's current form is optimal. I know, everybody knows I guess. But that is what this list is for, discussing when a driver is ready to be mainlined. And without regmap and proper i2c client handling, I have a feeling that it is not close. >>> + /* if necessary, disable multi-master: */ >>> + if (priv->rev == TDA19989) >>> + reg_set(encoder, REG_I2C_MASTER, I2C_MASTER_DIS_MM); >>> + >>> + cec_write(encoder, REG_CEC_FRO_IM_CLK_CTRL, >>> + CEC_FRO_IM_CLK_CTRL_GHOST_DIS | >>> CEC_FRO_IM_CLK_CTRL_IMCLK_SEL); >>> + >>> + return 0; >>> + >>> +fail: >>> + /* if encoder_init fails, the encoder slave is never registered, >>> + * so cleanup here: >>> + */ >>> + if (priv->cec) >>> + i2c_unregister_device(priv->cec); >>> + kfree(priv); >>> + encoder_slave->slave_priv = NULL; >>> + encoder_slave->slave_funcs = NULL; >>> + return -ENXIO; >>> +} >>> + >>> +static struct i2c_device_id tda998x_ids[] = { >>> + { "tda998x", 0 }, >>> + { } >>> +}; >>> +MODULE_DEVICE_TABLE(i2c, tda998x_ids); >> >> >> Shouldn't the above carry the hdmi core i2c address at least? >> > > no, it should come from the user of the encoder slave. Actually the > CEC address should too, but current drm i2c encoder slave code sort of > assumes the device just has a single address Hmm, that is a limitation for sure. Well I checked drm_encoder_slave and it is calling i2c_register_driver directly. Passing a valid i2c slave address will work here. For the cec i2c slave, we at least know that it is on the same i2c bus and can probe it during _init or _probe ourselves. Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Thu, Jan 31, 2013 at 2:14 PM, Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> wrote: > On 01/31/2013 03:23 PM, Rob Clark wrote: >> >> On Wed, Jan 30, 2013 at 8:23 PM, Sebastian Hesselbarth >> <sebastian.hesselbarth@gmail.com> wrote: >>> >>> On 01/29/2013 06:23 PM, Rob Clark wrote: > > [...] >>>> >>>> + >>>> +/* The TDA9988 series of devices use a paged register scheme.. to >>>> simplify >>>> + * things we encode the page # in upper bits of the register #. To >>>> read/ >>>> + * write a given register, we need to make sure CURPAGE register is set >>>> + * appropriately. Which implies reads/writes are not atomic. Fun! >>>> + */ >>> >>> >>> Please have a look at regmap-i2c, it also supports paged i2c registers >>> and will save you _a lot_ of the i2c handling. >> >> >> Yeah, I have looked at it, and will eventually convert over to using >> it. The problems at the moment are that I don't really have enough >> documentation about the chip at the register level to properly use the >> caching modes, and from my digging through the regmap code it looked >> like paged regmap + non-caching will result in writes to the page >> register for every transaction. That, and a bit of docs or few more >> examples of using the paging support in regmap would be nice. For >> now, I am punting on regmap conversion. > > > Hmm, flipping through the public tda998x sources *sigh* I found a > quite complete register list that also states if registers are RO or RW. > Even if you are not using all registers you can still prevent regmap from > reading/writing to them. But yes, documentation lacks some examples ;) > > >>>> [...] >>>> + >>>> +/* Device versions: */ >>>> +#define TDA9989N2 0x0101 >>>> +#define TDA19989 0x0201 >>>> +#define TDA19989N2 0x0202 >>>> +#define TDA19988 0x0301 >>> >>> >>> >>> Maybe split this into device_version/revision? What does N2 stand for >>> or is this the name NXP uses for that device? >> >> >> The register names are based on the names used in the NXP out-of-tree >> driver (the 50kloc monstrosity, if you've seen it).. that was pretty >> much all the register level documentation I had. > > > Yeah, but there is a comment about N2, that says the last bit is "not a > register bit, but is derived by the driver from the new N5 registers..". > I guess you will not see that many i2c devices returning you "N2" version > registers.. > hmm, maybe you are looking at a different (newer?) version of the nxp code? I did not see this. Perhaps the "n2" stuff isn't too critical, but I figured it would be nice to see if someone is trying to bring up a device with one of these parts and I ask them to send me a boot log with drm traces enabled > >>>> [...] >>> >>> >>>> +static void >>>> +cec_write(struct drm_encoder *encoder, uint16_t addr, uint8_t val) >>>> +{ >>>> + struct i2c_client *client = to_tda998x_priv(encoder)->cec; >>>> + uint8_t buf[] = {addr, val}; >>>> + int ret; >>>> + >>>> + ret = i2c_master_send(client, buf, ARRAY_SIZE(buf)); >>>> + if (ret< 0) >>>> + dev_err(&client->dev, "Error %d writing to cec:0x%x\n", >>>> ret, addr); >>>> +} >>> >>> >>> >>> Has there been any decision on how to split/integrate cec from drm? >>> Or is there display stuff located in cec i2c slave (I see HPD in >>> ..._detect below)? >> >> >> not sure, but at least in this case it can't really be decoupled. I >> need to use the CEC interface for HPD (as you noticed) and also to >> power up the HDMI bits.. > > > Just to make things clearer here, TDA998x ususally has two i2c slaves > at power-up, 0x70 (hdmi slave) and 0x34 (cec slave). Are you actually > accessing the cec slave? yes, as I mentioned, it is not possible to access the hdmi slave without first accessing the cec slave to enable the hdmi slave > [...] > >>>> +static bool >>>> +tda998x_encoder_mode_fixup(struct drm_encoder *encoder, >>>> + const struct drm_display_mode *mode, >>>> + struct drm_display_mode *adjusted_mode) >>>> +{ >>>> + return true; >>>> +} >>>> + >>>> +static int >>>> +tda998x_encoder_mode_valid(struct drm_encoder *encoder, >>>> + struct drm_display_mode *mode) >>>> +{ >>>> + return MODE_OK; >>>> +} >>> >>> >>> >>> At least a note would be helpful to see what callbacks are >>> not yet done. I guess there will be some kind of mode check >>> someday? >> >> >> Well, some of these drm will assume the fxn ptrs are not null, so we >> need something even if it is empty. >> >> I suppose there are must be some upper bounds on pixel clock >> supported, which could perhaps be added some day in _mode_valid(). On > > > Depends what drm expects on mode_valid or mode_fixup, I haven't dug into > drm encoders, yet. But usually for HDMI/DVI you will only choose between > modes supplied by monitor EDID and not choose something "close". Anyway, > I just think a note about stuff that is not yet working is helpful. > I would put a note if there was something that was not working about it ;-) Currently there is no need to validate or fixup the mode, which is why these functions are empty. DRM has hooks for the drivers at many point. Not always are all of them needed, in this case they are not needed. > >> the device I am working on, the limiting factor is the crtc (upstream >> of the encoder), so I haven't really needed this yet. I expect that >> as people start using this on some other devices, we'll come across >> some enhancements needed, some places where we need to add some >> configuration, etc. I cannot really predict exactly what is needed, >> so I prefer just to put the driver out there in some form, and then >> add it it as needed. So, I wouldn't really say that these functions >> are "TODO", but I also wouldn't say that we won't find some reason to >> add some code there at some point. > > > Or put it in staging? > that won't work too well if we end up having to add a header and config info struct to be passed in from the driver using the encoder slave > >>>> [...] >>>> >>>> +static enum drm_connector_status >>>> +tda998x_encoder_detect(struct drm_encoder *encoder, >>>> + struct drm_connector *connector) >>>> +{ >>>> + uint8_t val = cec_read(encoder, REG_CEC_RXSHPDLEV); >>>> + return (val& CEC_RXSHPDLEV_HPD) ? connector_status_connected : >>>> + connector_status_disconnected; >>>> +} >>> >>> >>> >>> This is where cec slave gets called from hdmi i2c driver. Any chance >>> there is HPD status in hdmi registers, too? >> >> >> Not that I know of. But like I mentioned, we also need to use the CEC >> interface just to talk to the HDMI interface. Before setting ENAMODS >> reg via cec address, the hdmi address won't even show up (for ex, on >> i2cdetect). > > > Again, I quickly checked the public sources. The cec slave looks like is > only for cec communication, i.e. actually sending/receiving messages. > But from your patch it isn't even clear to me, when you access hdmi or > cec slave as you are bypassing i2c client subsystem somehow. > The cec_read()/cec_write() fxns use the cec i2c_client ptr. They are accessing the cec slave. I'm not really sure how that is unclear. There is not really anything being bypassed here. Anyways, like I mentioned, the cec slave needs to be accessed before the hdmi slave can be accessed at all. > >> Maybe there is some way that this code should register some interface >> with CEC driver/subsystem? (Is there such a thing? I am not really >> CEC expert.) But I don't think there is any way to completely split >> it out. > > > When speaking about CEC subsystem you mean sending/receiving cec messages > and the corresponding kernel API? That can come later, for now everything > this driver needs can IMHO depend on EDID, i.e. DVI-style, only. > CEC communication can come later. > Yes, presumably other than internal use (enabling hdmi subsystem, hpd, etc), the other interesting use for CEC would be to enable sending/receiving CEC messages. If there is some kernel subsystem for this, presumably the i2c encoder slave would need to register some sort of cec_adapter with this subsystem. I haven't really concerned myself with this too much. I expect enabling hdmi audio is probably the more interesting next-feature. > >>>> +/* I2C driver functions */ >>>> + >>>> +static int >>>> +tda998x_probe(struct i2c_client *client, const struct i2c_device_id >>>> *id) >>>> +{ >>>> + return 0; >>>> +} >>>> + >>>> +static int >>>> +tda998x_remove(struct i2c_client *client) >>>> +{ >>>> + return 0; >>>> +} >>> >>> >>> >>> Hmm, empty _probe and _remove? Maybe these should get some code >>> from _init below? >> >> >> naw, they aren't really used for drm i2c encoder slaves. > > > Well, if you use a i2c_client_addr != 0 below, the i2c subsystem will only > bother you if it finds e.g. device 0x70 on an i2c bus. So they should be > used. The drm API must be clear about what should happen in encoder_init > and encoder_probe. btw, if you haven't already, please look at drm_i2c_encoder_init() to see how the i2c encoder slave is loaded and connected to it's master driver. I suppose, in theory I could read the device version information in the _probe(). But this can't even be read until accessing the CEC interface to enable hdmi. So I end up reading the revision and potentially failing later. But for this hw, there isn't really a better way because of the goofy way that the hdmi interface cannot be accessed until after it is switched on via cec interface. > >>>> +static int >>>> +tda998x_encoder_init(struct i2c_client *client, >>>> + struct drm_device *dev, >>>> + struct drm_encoder_slave *encoder_slave) >>>> +{ >>>> + struct drm_encoder *encoder =&encoder_slave->base; >>>> >>>> + struct tda998x_priv *priv; >>>> + >>>> + priv = kzalloc(sizeof(*priv), GFP_KERNEL); >>>> + if (!priv) >>>> + return -ENOMEM; >>>> + >>>> + priv->current_page = 0; >>>> + priv->cec = i2c_new_dummy(client->adapter, 0x34); >>>> + priv->dpms = DRM_MODE_DPMS_OFF; >>>> + >>>> + encoder_slave->slave_priv = priv; >>>> + encoder_slave->slave_funcs =&tda998x_encoder_funcs; >>>> + >>>> + /* wake up the device: */ >>>> + cec_write(encoder, REG_CEC_ENAMODS, >>>> + CEC_ENAMODS_EN_RXSENS | CEC_ENAMODS_EN_HDMI); >>>> + >>>> + tda998x_reset(encoder); >>>> + >>>> + /* read version: */ >>>> + priv->rev = reg_read(encoder, REG_VERSION_LSB) | >>>> + reg_read(encoder, REG_VERSION_MSB)<< 8; >>>> + >>>> + /* mask off feature bits: */ >>>> + priv->rev&= ~0x30; /* not-hdcp and not-scalar bit */ >>> >>> >>> >>> If revision register contains features, why not save them for later >>> driver improvements? >>> >> >> can be added later if the need arises. I prefer to leave out code >> that only might be used later.. otherwise it is a good way to >> accumulate cruft. > > > True, but magic masking (~0x30) and some comments don't help either. > > >>> >>>> + switch (priv->rev) { >>>> + case TDA9989N2: dev_info(dev->dev, "found TDA9989 n2"); break; >>>> + case TDA19989: dev_info(dev->dev, "found TDA19989"); break; >>>> + case TDA19989N2: dev_info(dev->dev, "found TDA19989 n2"); break; >>>> + case TDA19988: dev_info(dev->dev, "found TDA19988"); break; >>>> + default: >>>> + DBG("found unsupported device: %04x", priv->rev); >>>> + goto fail; >>>> + } >>> >>> >>> >>> I think printing revision is sufficient, no user will care about the >>> actual device or revision. >>> >>> >>>> + /* after reset, enable DDC: */ >>>> + reg_write(encoder, REG_DDC_DISABLE, 0x00); >>>> + >>>> + /* set clock on DDC channel: */ >>>> + reg_write(encoder, REG_TX3, 39); >>> >>> >>> >>> This should be kept disabled as long as there is no monitor attached >>> (HPD!) >>> >> >> The sequence is based on NXP's driver.. I'll have to go back and >> check, but IIRC there were a few things I had to turn on just to make >> HPD work in the first place. > > > Hmm, I have seen a note about issues with some monitors that expect > ddc clock to be stable very early. And this looks like the NXP proposed > workaround to always clock ddc - but it tells nothing about the reason > and more important the note from NXP clearly puts some restrictions on > how hdmi tx needs to be clocked by pixclk. Can you ensure a stable pixclk > at this point at all? > In my experience it is not depending on pixel clock from crtc. Or at least it isn't turned on at this point and doesn't seem to cause issues. The drm core will not enable the crtc until long after the edid is read. > >> Ofc, if there were actually some decent docs about the part, it would >> be a bit easier to know what is actually required and what is not. So >> I don't claim everything in it's current form is optimal. > > > I know, everybody knows I guess. But that is what this list is for, > discussing when a driver is ready to be mainlined. And without regmap > and proper i2c client handling, I have a feeling that it is not close. > There is not really anything wrong with the i2c client handling, or rather it works the way that drm i2c encoder slave infrastructure expects. regmap, I'd partially agree.. I'd prefer to use it. But it doesn't really bring that much benefit and the requirements are a bit steep considering what is known / not-known about this hw. > >>>> + /* if necessary, disable multi-master: */ >>>> + if (priv->rev == TDA19989) >>>> + reg_set(encoder, REG_I2C_MASTER, I2C_MASTER_DIS_MM); >>>> + >>>> + cec_write(encoder, REG_CEC_FRO_IM_CLK_CTRL, >>>> + CEC_FRO_IM_CLK_CTRL_GHOST_DIS | >>>> CEC_FRO_IM_CLK_CTRL_IMCLK_SEL); >>>> + >>>> + return 0; >>>> + >>>> +fail: >>>> + /* if encoder_init fails, the encoder slave is never registered, >>>> + * so cleanup here: >>>> + */ >>>> + if (priv->cec) >>>> + i2c_unregister_device(priv->cec); >>>> + kfree(priv); >>>> + encoder_slave->slave_priv = NULL; >>>> + encoder_slave->slave_funcs = NULL; >>>> + return -ENXIO; >>>> +} >>>> + >>>> +static struct i2c_device_id tda998x_ids[] = { >>>> + { "tda998x", 0 }, >>>> + { } >>>> +}; >>>> +MODULE_DEVICE_TABLE(i2c, tda998x_ids); >>> >>> >>> >>> Shouldn't the above carry the hdmi core i2c address at least? >>> >> >> no, it should come from the user of the encoder slave. Actually the >> CEC address should too, but current drm i2c encoder slave code sort of >> assumes the device just has a single address > > > Hmm, that is a limitation for sure. Well I checked drm_encoder_slave and > it is calling i2c_register_driver directly. Passing a valid i2c slave > address > will work here. note that the hdmi interface cannot be probed until after enabling it via cec interface BR, -R > For the cec i2c slave, we at least know that it is on the same i2c bus > and can probe it during _init or _probe ourselves. > > Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/gpu/drm/i2c/Kconfig b/drivers/gpu/drm/i2c/Kconfig index 1611836..4d341db 100644 --- a/drivers/gpu/drm/i2c/Kconfig +++ b/drivers/gpu/drm/i2c/Kconfig @@ -19,4 +19,10 @@ config DRM_I2C_SIL164 when used in pairs) TMDS transmitters, used in some nVidia video cards. +config DRM_I2C_NXP_TDA998X + tristate "NXP Semiconductors TDA998X HDMI encoder" + default m if DRM_TILCDC + help + Support for NXP Semiconductors TDA998X HDMI encoders. + endmenu diff --git a/drivers/gpu/drm/i2c/Makefile b/drivers/gpu/drm/i2c/Makefile index 9286256..43aa33b 100644 --- a/drivers/gpu/drm/i2c/Makefile +++ b/drivers/gpu/drm/i2c/Makefile @@ -5,3 +5,6 @@ obj-$(CONFIG_DRM_I2C_CH7006) += ch7006.o sil164-y := sil164_drv.o obj-$(CONFIG_DRM_I2C_SIL164) += sil164.o + +tda998x-y := tda998x_drv.o +obj-$(CONFIG_DRM_I2C_NXP_TDA998X) += tda998x.o diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c new file mode 100644 index 0000000..e68b58a --- /dev/null +++ b/drivers/gpu/drm/i2c/tda998x_drv.c @@ -0,0 +1,906 @@ +/* + * Copyright (C) 2012 Texas Instruments + * Author: Rob Clark <robdclark@gmail.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + + + +#include <linux/module.h> + +#include <drm/drmP.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_encoder_slave.h> +#include <drm/drm_edid.h> + + +#define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__) + +struct tda998x_priv { + struct i2c_client *cec; + uint16_t rev; + uint8_t current_page; + int dpms; +}; + +#define to_tda998x_priv(x) ((struct tda998x_priv *)to_encoder_slave(x)->slave_priv) + +/* The TDA9988 series of devices use a paged register scheme.. to simplify + * things we encode the page # in upper bits of the register #. To read/ + * write a given register, we need to make sure CURPAGE register is set + * appropriately. Which implies reads/writes are not atomic. Fun! + */ + +#define REG(page, addr) (((page) << 8) | (addr)) +#define REG2ADDR(reg) ((reg) & 0xff) +#define REG2PAGE(reg) (((reg) >> 8) & 0xff) + +#define REG_CURPAGE 0xff /* write */ + + +/* Page 00h: General Control */ +#define REG_VERSION_LSB REG(0x00, 0x00) /* read */ +#define REG_MAIN_CNTRL0 REG(0x00, 0x01) /* read/write */ +# define MAIN_CNTRL0_SR (1 << 0) +# define MAIN_CNTRL0_DECS (1 << 1) +# define MAIN_CNTRL0_DEHS (1 << 2) +# define MAIN_CNTRL0_CECS (1 << 3) +# define MAIN_CNTRL0_CEHS (1 << 4) +# define MAIN_CNTRL0_SCALER (1 << 7) +#define REG_VERSION_MSB REG(0x00, 0x02) /* read */ +#define REG_SOFTRESET REG(0x00, 0x0a) /* write */ +# define SOFTRESET_AUDIO (1 << 0) +# define SOFTRESET_I2C_MASTER (1 << 1) +#define REG_DDC_DISABLE REG(0x00, 0x0b) /* read/write */ +#define REG_CCLK_ON REG(0x00, 0x0c) /* read/write */ +#define REG_I2C_MASTER REG(0x00, 0x0d) /* read/write */ +# define I2C_MASTER_DIS_MM (1 << 0) +# define I2C_MASTER_DIS_FILT (1 << 1) +# define I2C_MASTER_APP_STRT_LAT (1 << 2) +#define REG_INT_FLAGS_0 REG(0x00, 0x0f) /* read/write */ +#define REG_INT_FLAGS_1 REG(0x00, 0x10) /* read/write */ +#define REG_INT_FLAGS_2 REG(0x00, 0x11) /* read/write */ +# define INT_FLAGS_2_EDID_BLK_RD (1 << 1) +#define REG_ENA_VP_0 REG(0x00, 0x18) /* read/write */ +#define REG_ENA_VP_1 REG(0x00, 0x19) /* read/write */ +#define REG_ENA_VP_2 REG(0x00, 0x1a) /* read/write */ +#define REG_ENA_AP REG(0x00, 0x1e) /* read/write */ +#define REG_VIP_CNTRL_0 REG(0x00, 0x20) /* write */ +# define VIP_CNTRL_0_MIRR_A (1 << 7) +# define VIP_CNTRL_0_SWAP_A(x) (((x) & 7) << 4) +# define VIP_CNTRL_0_MIRR_B (1 << 3) +# define VIP_CNTRL_0_SWAP_B(x) (((x) & 7) << 0) +#define REG_VIP_CNTRL_1 REG(0x00, 0x21) /* write */ +# define VIP_CNTRL_1_MIRR_C (1 << 7) +# define VIP_CNTRL_1_SWAP_C(x) (((x) & 7) << 4) +# define VIP_CNTRL_1_MIRR_D (1 << 3) +# define VIP_CNTRL_1_SWAP_D(x) (((x) & 7) << 0) +#define REG_VIP_CNTRL_2 REG(0x00, 0x22) /* write */ +# define VIP_CNTRL_2_MIRR_E (1 << 7) +# define VIP_CNTRL_2_SWAP_E(x) (((x) & 7) << 4) +# define VIP_CNTRL_2_MIRR_F (1 << 3) +# define VIP_CNTRL_2_SWAP_F(x) (((x) & 7) << 0) +#define REG_VIP_CNTRL_3 REG(0x00, 0x23) /* write */ +# define VIP_CNTRL_3_X_TGL (1 << 0) +# define VIP_CNTRL_3_H_TGL (1 << 1) +# define VIP_CNTRL_3_V_TGL (1 << 2) +# define VIP_CNTRL_3_EMB (1 << 3) +# define VIP_CNTRL_3_SYNC_DE (1 << 4) +# define VIP_CNTRL_3_SYNC_HS (1 << 5) +# define VIP_CNTRL_3_DE_INT (1 << 6) +# define VIP_CNTRL_3_EDGE (1 << 7) +#define REG_VIP_CNTRL_4 REG(0x00, 0x24) /* write */ +# define VIP_CNTRL_4_BLC(x) (((x) & 3) << 0) +# define VIP_CNTRL_4_BLANKIT(x) (((x) & 3) << 2) +# define VIP_CNTRL_4_CCIR656 (1 << 4) +# define VIP_CNTRL_4_656_ALT (1 << 5) +# define VIP_CNTRL_4_TST_656 (1 << 6) +# define VIP_CNTRL_4_TST_PAT (1 << 7) +#define REG_VIP_CNTRL_5 REG(0x00, 0x25) /* write */ +# define VIP_CNTRL_5_CKCASE (1 << 0) +# define VIP_CNTRL_5_SP_CNT(x) (((x) & 3) << 1) +#define REG_MAT_CONTRL REG(0x00, 0x80) /* write */ +# define MAT_CONTRL_MAT_SC(x) (((x) & 3) << 0) +# define MAT_CONTRL_MAT_BP (1 << 2) +#define REG_VIDFORMAT REG(0x00, 0xa0) /* write */ +#define REG_REFPIX_MSB REG(0x00, 0xa1) /* write */ +#define REG_REFPIX_LSB REG(0x00, 0xa2) /* write */ +#define REG_REFLINE_MSB REG(0x00, 0xa3) /* write */ +#define REG_REFLINE_LSB REG(0x00, 0xa4) /* write */ +#define REG_NPIX_MSB REG(0x00, 0xa5) /* write */ +#define REG_NPIX_LSB REG(0x00, 0xa6) /* write */ +#define REG_NLINE_MSB REG(0x00, 0xa7) /* write */ +#define REG_NLINE_LSB REG(0x00, 0xa8) /* write */ +#define REG_VS_LINE_STRT_1_MSB REG(0x00, 0xa9) /* write */ +#define REG_VS_LINE_STRT_1_LSB REG(0x00, 0xaa) /* write */ +#define REG_VS_PIX_STRT_1_MSB REG(0x00, 0xab) /* write */ +#define REG_VS_PIX_STRT_1_LSB REG(0x00, 0xac) /* write */ +#define REG_VS_LINE_END_1_MSB REG(0x00, 0xad) /* write */ +#define REG_VS_LINE_END_1_LSB REG(0x00, 0xae) /* write */ +#define REG_VS_PIX_END_1_MSB REG(0x00, 0xaf) /* write */ +#define REG_VS_PIX_END_1_LSB REG(0x00, 0xb0) /* write */ +#define REG_VS_PIX_STRT_2_MSB REG(0x00, 0xb3) /* write */ +#define REG_VS_PIX_STRT_2_LSB REG(0x00, 0xb4) /* write */ +#define REG_VS_PIX_END_2_MSB REG(0x00, 0xb7) /* write */ +#define REG_VS_PIX_END_2_LSB REG(0x00, 0xb8) /* write */ +#define REG_HS_PIX_START_MSB REG(0x00, 0xb9) /* write */ +#define REG_HS_PIX_START_LSB REG(0x00, 0xba) /* write */ +#define REG_HS_PIX_STOP_MSB REG(0x00, 0xbb) /* write */ +#define REG_HS_PIX_STOP_LSB REG(0x00, 0xbc) /* write */ +#define REG_VWIN_START_1_MSB REG(0x00, 0xbd) /* write */ +#define REG_VWIN_START_1_LSB REG(0x00, 0xbe) /* write */ +#define REG_VWIN_END_1_MSB REG(0x00, 0xbf) /* write */ +#define REG_VWIN_END_1_LSB REG(0x00, 0xc0) /* write */ +#define REG_DE_START_MSB REG(0x00, 0xc5) /* write */ +#define REG_DE_START_LSB REG(0x00, 0xc6) /* write */ +#define REG_DE_STOP_MSB REG(0x00, 0xc7) /* write */ +#define REG_DE_STOP_LSB REG(0x00, 0xc8) /* write */ +#define REG_TBG_CNTRL_0 REG(0x00, 0xca) /* write */ +# define TBG_CNTRL_0_FRAME_DIS (1 << 5) +# define TBG_CNTRL_0_SYNC_MTHD (1 << 6) +# define TBG_CNTRL_0_SYNC_ONCE (1 << 7) +#define REG_TBG_CNTRL_1 REG(0x00, 0xcb) /* write */ +# define TBG_CNTRL_1_VH_TGL_0 (1 << 0) +# define TBG_CNTRL_1_VH_TGL_1 (1 << 1) +# define TBG_CNTRL_1_VH_TGL_2 (1 << 2) +# define TBG_CNTRL_1_VHX_EXT_DE (1 << 3) +# define TBG_CNTRL_1_VHX_EXT_HS (1 << 4) +# define TBG_CNTRL_1_VHX_EXT_VS (1 << 5) +# define TBG_CNTRL_1_DWIN_DIS (1 << 6) +#define REG_ENABLE_SPACE REG(0x00, 0xd6) /* write */ +#define REG_HVF_CNTRL_0 REG(0x00, 0xe4) /* write */ +# define HVF_CNTRL_0_SM (1 << 7) +# define HVF_CNTRL_0_RWB (1 << 6) +# define HVF_CNTRL_0_PREFIL(x) (((x) & 3) << 2) +# define HVF_CNTRL_0_INTPOL(x) (((x) & 3) << 0) +#define REG_HVF_CNTRL_1 REG(0x00, 0xe5) /* write */ +# define HVF_CNTRL_1_FOR (1 << 0) +# define HVF_CNTRL_1_YUVBLK (1 << 1) +# define HVF_CNTRL_1_VQR(x) (((x) & 3) << 2) +# define HVF_CNTRL_1_PAD(x) (((x) & 3) << 4) +# define HVF_CNTRL_1_SEMI_PLANAR (1 << 6) +#define REG_RPT_CNTRL REG(0x00, 0xf0) /* write */ + + +/* Page 02h: PLL settings */ +#define REG_PLL_SERIAL_1 REG(0x02, 0x00) /* read/write */ +# define PLL_SERIAL_1_SRL_FDN (1 << 0) +# define PLL_SERIAL_1_SRL_IZ(x) (((x) & 3) << 1) +# define PLL_SERIAL_1_SRL_MAN_IZ (1 << 6) +#define REG_PLL_SERIAL_2 REG(0x02, 0x01) /* read/write */ +# define PLL_SERIAL_2_SRL_NOSC(x) (((x) & 3) << 0) +# define PLL_SERIAL_2_SRL_PR(x) (((x) & 0xf) << 4) +#define REG_PLL_SERIAL_3 REG(0x02, 0x02) /* read/write */ +# define PLL_SERIAL_3_SRL_CCIR (1 << 0) +# define PLL_SERIAL_3_SRL_DE (1 << 2) +# define PLL_SERIAL_3_SRL_PXIN_SEL (1 << 4) +#define REG_SERIALIZER REG(0x02, 0x03) /* read/write */ +#define REG_BUFFER_OUT REG(0x02, 0x04) /* read/write */ +#define REG_PLL_SCG1 REG(0x02, 0x05) /* read/write */ +#define REG_PLL_SCG2 REG(0x02, 0x06) /* read/write */ +#define REG_PLL_SCGN1 REG(0x02, 0x07) /* read/write */ +#define REG_PLL_SCGN2 REG(0x02, 0x08) /* read/write */ +#define REG_PLL_SCGR1 REG(0x02, 0x09) /* read/write */ +#define REG_PLL_SCGR2 REG(0x02, 0x0a) /* read/write */ +#define REG_AUDIO_DIV REG(0x02, 0x0e) /* read/write */ +#define REG_SEL_CLK REG(0x02, 0x11) /* read/write */ +# define SEL_CLK_SEL_CLK1 (1 << 0) +# define SEL_CLK_SEL_VRF_CLK(x) (((x) & 3) << 1) +# define SEL_CLK_ENA_SC_CLK (1 << 3) +#define REG_ANA_GENERAL REG(0x02, 0x12) /* read/write */ + + +/* Page 09h: EDID Control */ +#define REG_EDID_DATA_0 REG(0x09, 0x00) /* read */ +/* next 127 successive registers are the EDID block */ +#define REG_EDID_CTRL REG(0x09, 0xfa) /* read/write */ +#define REG_DDC_ADDR REG(0x09, 0xfb) /* read/write */ +#define REG_DDC_OFFS REG(0x09, 0xfc) /* read/write */ +#define REG_DDC_SEGM_ADDR REG(0x09, 0xfd) /* read/write */ +#define REG_DDC_SEGM REG(0x09, 0xfe) /* read/write */ + + +/* Page 10h: information frames and packets */ + + +/* Page 11h: audio settings and content info packets */ +#define REG_AIP_CNTRL_0 REG(0x11, 0x00) /* read/write */ +# define AIP_CNTRL_0_RST_FIFO (1 << 0) +# define AIP_CNTRL_0_SWAP (1 << 1) +# define AIP_CNTRL_0_LAYOUT (1 << 2) +# define AIP_CNTRL_0_ACR_MAN (1 << 5) +# define AIP_CNTRL_0_RST_CTS (1 << 6) +#define REG_ENC_CNTRL REG(0x11, 0x0d) /* read/write */ +# define ENC_CNTRL_RST_ENC (1 << 0) +# define ENC_CNTRL_RST_SEL (1 << 1) +# define ENC_CNTRL_CTL_CODE(x) (((x) & 3) << 2) + + +/* Page 12h: HDCP and OTP */ +#define REG_TX3 REG(0x12, 0x9a) /* read/write */ +#define REG_TX33 REG(0x12, 0xb8) /* read/write */ +# define TX33_HDMI (1 << 1) + + +/* Page 13h: Gamut related metadata packets */ + + + +/* CEC registers: (not paged) + */ +#define REG_CEC_FRO_IM_CLK_CTRL 0xfb /* read/write */ +# define CEC_FRO_IM_CLK_CTRL_GHOST_DIS (1 << 7) +# define CEC_FRO_IM_CLK_CTRL_ENA_OTP (1 << 6) +# define CEC_FRO_IM_CLK_CTRL_IMCLK_SEL (1 << 1) +# define CEC_FRO_IM_CLK_CTRL_FRO_DIV (1 << 0) +#define REG_CEC_RXSHPDLEV 0xfe /* read */ +# define CEC_RXSHPDLEV_RXSENS (1 << 0) +# define CEC_RXSHPDLEV_HPD (1 << 1) + +#define REG_CEC_ENAMODS 0xff /* read/write */ +# define CEC_ENAMODS_DIS_FRO (1 << 6) +# define CEC_ENAMODS_DIS_CCLK (1 << 5) +# define CEC_ENAMODS_EN_RXSENS (1 << 2) +# define CEC_ENAMODS_EN_HDMI (1 << 1) +# define CEC_ENAMODS_EN_CEC (1 << 0) + + +/* Device versions: */ +#define TDA9989N2 0x0101 +#define TDA19989 0x0201 +#define TDA19989N2 0x0202 +#define TDA19988 0x0301 + +static void +cec_write(struct drm_encoder *encoder, uint16_t addr, uint8_t val) +{ + struct i2c_client *client = to_tda998x_priv(encoder)->cec; + uint8_t buf[] = {addr, val}; + int ret; + + ret = i2c_master_send(client, buf, ARRAY_SIZE(buf)); + if (ret < 0) + dev_err(&client->dev, "Error %d writing to cec:0x%x\n", ret, addr); +} + +static uint8_t +cec_read(struct drm_encoder *encoder, uint8_t addr) +{ + struct i2c_client *client = to_tda998x_priv(encoder)->cec; + uint8_t val; + int ret; + + ret = i2c_master_send(client, &addr, sizeof(addr)); + if (ret < 0) + goto fail; + + ret = i2c_master_recv(client, &val, sizeof(val)); + if (ret < 0) + goto fail; + + return val; + +fail: + dev_err(&client->dev, "Error %d reading from cec:0x%x\n", ret, addr); + return 0; +} + +static void +set_page(struct drm_encoder *encoder, uint16_t reg) +{ + struct tda998x_priv *priv = to_tda998x_priv(encoder); + + if (REG2PAGE(reg) != priv->current_page) { + struct i2c_client *client = drm_i2c_encoder_get_client(encoder); + uint8_t buf[] = { + REG_CURPAGE, REG2PAGE(reg) + }; + int ret = i2c_master_send(client, buf, sizeof(buf)); + if (ret < 0) + dev_err(&client->dev, "Error %d writing to REG_CURPAGE\n", ret); + + priv->current_page = REG2PAGE(reg); + } +} + +static int +reg_read_range(struct drm_encoder *encoder, uint16_t reg, char *buf, int cnt) +{ + struct i2c_client *client = drm_i2c_encoder_get_client(encoder); + uint8_t addr = REG2ADDR(reg); + int ret; + + set_page(encoder, reg); + + ret = i2c_master_send(client, &addr, sizeof(addr)); + if (ret < 0) + goto fail; + + ret = i2c_master_recv(client, buf, cnt); + if (ret < 0) + goto fail; + + return ret; + +fail: + dev_err(&client->dev, "Error %d reading from 0x%x\n", ret, reg); + return ret; +} + +static uint8_t +reg_read(struct drm_encoder *encoder, uint16_t reg) +{ + uint8_t val = 0; + reg_read_range(encoder, reg, &val, sizeof(val)); + return val; +} + +static void +reg_write(struct drm_encoder *encoder, uint16_t reg, uint8_t val) +{ + struct i2c_client *client = drm_i2c_encoder_get_client(encoder); + uint8_t buf[] = {REG2ADDR(reg), val}; + int ret; + + set_page(encoder, reg); + + ret = i2c_master_send(client, buf, ARRAY_SIZE(buf)); + if (ret < 0) + dev_err(&client->dev, "Error %d writing to 0x%x\n", ret, reg); +} + +static void +reg_write16(struct drm_encoder *encoder, uint16_t reg, uint16_t val) +{ + struct i2c_client *client = drm_i2c_encoder_get_client(encoder); + uint8_t buf[] = {REG2ADDR(reg), val >> 8, val}; + int ret; + + set_page(encoder, reg); + + ret = i2c_master_send(client, buf, ARRAY_SIZE(buf)); + if (ret < 0) + dev_err(&client->dev, "Error %d writing to 0x%x\n", ret, reg); +} + +static void +reg_set(struct drm_encoder *encoder, uint16_t reg, uint8_t val) +{ + reg_write(encoder, reg, reg_read(encoder, reg) | val); +} + +static void +reg_clear(struct drm_encoder *encoder, uint16_t reg, uint8_t val) +{ + reg_write(encoder, reg, reg_read(encoder, reg) & ~val); +} + +static void +tda998x_reset(struct drm_encoder *encoder) +{ + /* reset audio and i2c master: */ + reg_set(encoder, REG_SOFTRESET, SOFTRESET_AUDIO | SOFTRESET_I2C_MASTER); + msleep(50); + reg_clear(encoder, REG_SOFTRESET, SOFTRESET_AUDIO | SOFTRESET_I2C_MASTER); + msleep(50); + + /* reset transmitter: */ + reg_set(encoder, REG_MAIN_CNTRL0, MAIN_CNTRL0_SR); + reg_clear(encoder, REG_MAIN_CNTRL0, MAIN_CNTRL0_SR); + + /* PLL registers common configuration */ + reg_write(encoder, REG_PLL_SERIAL_1, 0x00); + reg_write(encoder, REG_PLL_SERIAL_2, PLL_SERIAL_2_SRL_NOSC(1)); + reg_write(encoder, REG_PLL_SERIAL_3, 0x00); + reg_write(encoder, REG_SERIALIZER, 0x00); + reg_write(encoder, REG_BUFFER_OUT, 0x00); + reg_write(encoder, REG_PLL_SCG1, 0x00); + reg_write(encoder, REG_AUDIO_DIV, 0x03); + reg_write(encoder, REG_SEL_CLK, SEL_CLK_SEL_CLK1 | SEL_CLK_ENA_SC_CLK); + reg_write(encoder, REG_PLL_SCGN1, 0xfa); + reg_write(encoder, REG_PLL_SCGN2, 0x00); + reg_write(encoder, REG_PLL_SCGR1, 0x5b); + reg_write(encoder, REG_PLL_SCGR2, 0x00); + reg_write(encoder, REG_PLL_SCG2, 0x10); +} + +/* DRM encoder functions */ + +static void +tda998x_encoder_set_config(struct drm_encoder *encoder, void *params) +{ +} + +static void +tda998x_encoder_dpms(struct drm_encoder *encoder, int mode) +{ + struct tda998x_priv *priv = to_tda998x_priv(encoder); + + /* we only care about on or off: */ + if (mode != DRM_MODE_DPMS_ON) + mode = DRM_MODE_DPMS_OFF; + + if (mode == priv->dpms) + return; + + switch (mode) { + case DRM_MODE_DPMS_ON: + /* enable audio and video ports */ + reg_write(encoder, REG_ENA_AP, 0xff); + reg_write(encoder, REG_ENA_VP_0, 0xff); + reg_write(encoder, REG_ENA_VP_1, 0xff); + reg_write(encoder, REG_ENA_VP_2, 0xff); + /* set muxing after enabling ports: */ + reg_write(encoder, REG_VIP_CNTRL_0, + VIP_CNTRL_0_SWAP_A(2) | VIP_CNTRL_0_SWAP_B(3)); + reg_write(encoder, REG_VIP_CNTRL_1, + VIP_CNTRL_1_SWAP_C(0) | VIP_CNTRL_1_SWAP_D(1)); + reg_write(encoder, REG_VIP_CNTRL_2, + VIP_CNTRL_2_SWAP_E(4) | VIP_CNTRL_2_SWAP_F(5)); + break; + case DRM_MODE_DPMS_OFF: + /* disable audio and video ports */ + reg_write(encoder, REG_ENA_AP, 0x00); + reg_write(encoder, REG_ENA_VP_0, 0x00); + reg_write(encoder, REG_ENA_VP_1, 0x00); + reg_write(encoder, REG_ENA_VP_2, 0x00); + break; + } + + priv->dpms = mode; +} + +static void +tda998x_encoder_save(struct drm_encoder *encoder) +{ + DBG(""); +} + +static void +tda998x_encoder_restore(struct drm_encoder *encoder) +{ + DBG(""); +} + +static bool +tda998x_encoder_mode_fixup(struct drm_encoder *encoder, + const struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode) +{ + return true; +} + +static int +tda998x_encoder_mode_valid(struct drm_encoder *encoder, + struct drm_display_mode *mode) +{ + return MODE_OK; +} + +static void +tda998x_encoder_mode_set(struct drm_encoder *encoder, + struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode) +{ + struct tda998x_priv *priv = to_tda998x_priv(encoder); + uint16_t hs_start, hs_end, line_start, line_end; + uint16_t vwin_start, vwin_end, de_start, de_end; + uint16_t ref_pix, ref_line, pix_start2; + uint8_t reg, div, rep; + + hs_start = mode->hsync_start - mode->hdisplay; + hs_end = mode->hsync_end - mode->hdisplay; + line_start = 1; + line_end = 1 + mode->vsync_end - mode->vsync_start; + vwin_start = mode->vtotal - mode->vsync_start; + vwin_end = vwin_start + mode->vdisplay; + de_start = mode->htotal - mode->hdisplay; + de_end = mode->htotal; + + pix_start2 = 0; + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + pix_start2 = (mode->htotal / 2) + hs_start; + + /* TODO how is this value calculated? It is 2 for all common + * formats in the tables in out of tree nxp driver (assuming + * I've properly deciphered their byzantine table system) + */ + ref_line = 2; + + /* this might changes for other color formats from the CRTC: */ + ref_pix = 3 + hs_start; + + div = 148500 / mode->clock; + + DBG("clock=%d, div=%u", mode->clock, div); + DBG("hs_start=%u, hs_end=%u, line_start=%u, line_end=%u", + hs_start, hs_end, line_start, line_end); + DBG("vwin_start=%u, vwin_end=%u, de_start=%u, de_end=%u", + vwin_start, vwin_end, de_start, de_end); + DBG("ref_line=%u, ref_pix=%u, pix_start2=%u", + ref_line, ref_pix, pix_start2); + + /* mute the audio FIFO: */ + reg_set(encoder, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_FIFO); + + /* set HDMI HDCP mode off: */ + reg_set(encoder, REG_TBG_CNTRL_1, TBG_CNTRL_1_DWIN_DIS); + reg_clear(encoder, REG_TX33, TX33_HDMI); + + reg_write(encoder, REG_ENC_CNTRL, ENC_CNTRL_CTL_CODE(0)); + /* no pre-filter or interpolator: */ + reg_write(encoder, REG_HVF_CNTRL_0, HVF_CNTRL_0_PREFIL(0) | + HVF_CNTRL_0_INTPOL(0)); + reg_write(encoder, REG_VIP_CNTRL_5, VIP_CNTRL_5_SP_CNT(0)); + reg_write(encoder, REG_VIP_CNTRL_4, VIP_CNTRL_4_BLANKIT(0) | + VIP_CNTRL_4_BLC(0)); + reg_clear(encoder, REG_PLL_SERIAL_3, PLL_SERIAL_3_SRL_CCIR); + + reg_clear(encoder, REG_PLL_SERIAL_1, PLL_SERIAL_1_SRL_MAN_IZ); + reg_clear(encoder, REG_PLL_SERIAL_3, PLL_SERIAL_3_SRL_DE); + reg_write(encoder, REG_SERIALIZER, 0); + reg_write(encoder, REG_HVF_CNTRL_1, HVF_CNTRL_1_VQR(0)); + + /* TODO enable pixel repeat for pixel rates less than 25Msamp/s */ + rep = 0; + reg_write(encoder, REG_RPT_CNTRL, 0); + reg_write(encoder, REG_SEL_CLK, SEL_CLK_SEL_VRF_CLK(0) | + SEL_CLK_SEL_CLK1 | SEL_CLK_ENA_SC_CLK); + + reg_write(encoder, REG_PLL_SERIAL_2, PLL_SERIAL_2_SRL_NOSC(div) | + PLL_SERIAL_2_SRL_PR(rep)); + + reg_write16(encoder, REG_VS_PIX_STRT_2_MSB, pix_start2); + reg_write16(encoder, REG_VS_PIX_END_2_MSB, pix_start2); + + /* set color matrix bypass flag: */ + reg_set(encoder, REG_MAT_CONTRL, MAT_CONTRL_MAT_BP); + + /* set BIAS tmds value: */ + reg_write(encoder, REG_ANA_GENERAL, 0x09); + + reg_clear(encoder, REG_TBG_CNTRL_0, TBG_CNTRL_0_SYNC_MTHD); + + reg_write(encoder, REG_VIP_CNTRL_3, 0); + reg_set(encoder, REG_VIP_CNTRL_3, VIP_CNTRL_3_SYNC_HS); + if (mode->flags & DRM_MODE_FLAG_NVSYNC) + reg_set(encoder, REG_VIP_CNTRL_3, VIP_CNTRL_3_V_TGL); + + if (mode->flags & DRM_MODE_FLAG_NHSYNC) + reg_set(encoder, REG_VIP_CNTRL_3, VIP_CNTRL_3_H_TGL); + + reg_write(encoder, REG_VIDFORMAT, 0x00); + reg_write16(encoder, REG_NPIX_MSB, mode->hdisplay - 1); + reg_write16(encoder, REG_NLINE_MSB, mode->vdisplay - 1); + reg_write16(encoder, REG_VS_LINE_STRT_1_MSB, line_start); + reg_write16(encoder, REG_VS_LINE_END_1_MSB, line_end); + reg_write16(encoder, REG_VS_PIX_STRT_1_MSB, hs_start); + reg_write16(encoder, REG_VS_PIX_END_1_MSB, hs_start); + reg_write16(encoder, REG_HS_PIX_START_MSB, hs_start); + reg_write16(encoder, REG_HS_PIX_STOP_MSB, hs_end); + reg_write16(encoder, REG_VWIN_START_1_MSB, vwin_start); + reg_write16(encoder, REG_VWIN_END_1_MSB, vwin_end); + reg_write16(encoder, REG_DE_START_MSB, de_start); + reg_write16(encoder, REG_DE_STOP_MSB, de_end); + + if (priv->rev == TDA19988) { + /* let incoming pixels fill the active space (if any) */ + reg_write(encoder, REG_ENABLE_SPACE, 0x01); + } + + reg_write16(encoder, REG_REFPIX_MSB, ref_pix); + reg_write16(encoder, REG_REFLINE_MSB, ref_line); + + reg = TBG_CNTRL_1_VHX_EXT_DE | + TBG_CNTRL_1_VHX_EXT_HS | + TBG_CNTRL_1_VHX_EXT_VS | + TBG_CNTRL_1_DWIN_DIS | /* HDCP off */ + TBG_CNTRL_1_VH_TGL_2; + if (mode->flags & (DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC)) + reg |= TBG_CNTRL_1_VH_TGL_0; + reg_set(encoder, REG_TBG_CNTRL_1, reg); + + /* must be last register set: */ + reg_clear(encoder, REG_TBG_CNTRL_0, TBG_CNTRL_0_SYNC_ONCE); +} + +static enum drm_connector_status +tda998x_encoder_detect(struct drm_encoder *encoder, + struct drm_connector *connector) +{ + uint8_t val = cec_read(encoder, REG_CEC_RXSHPDLEV); + return (val & CEC_RXSHPDLEV_HPD) ? connector_status_connected : + connector_status_disconnected; +} + +static int +read_edid_block(struct drm_encoder *encoder, uint8_t *buf, int blk) +{ + uint8_t offset, segptr; + int ret, i; + + /* enable EDID read irq: */ + reg_set(encoder, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD); + + offset = (blk & 1) ? 128 : 0; + segptr = blk / 2; + + reg_write(encoder, REG_DDC_ADDR, 0xa0); + reg_write(encoder, REG_DDC_OFFS, offset); + reg_write(encoder, REG_DDC_SEGM_ADDR, 0x60); + reg_write(encoder, REG_DDC_SEGM, segptr); + + /* enable reading EDID: */ + reg_write(encoder, REG_EDID_CTRL, 0x1); + + /* flag must be cleared by sw: */ + reg_write(encoder, REG_EDID_CTRL, 0x0); + + /* wait for block read to complete: */ + for (i = 100; i > 0; i--) { + uint8_t val = reg_read(encoder, REG_INT_FLAGS_2); + if (val & INT_FLAGS_2_EDID_BLK_RD) + break; + msleep(1); + } + + if (i == 0) + return -ETIMEDOUT; + + ret = reg_read_range(encoder, REG_EDID_DATA_0, buf, EDID_LENGTH); + if (ret != EDID_LENGTH) { + dev_err(encoder->dev->dev, "failed to read edid block %d: %d", + blk, ret); + return ret; + } + + reg_clear(encoder, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD); + + return 0; +} + +static uint8_t * +do_get_edid(struct drm_encoder *encoder) +{ + int j = 0, valid_extensions = 0; + uint8_t *block, *new; + bool print_bad_edid = drm_debug & DRM_UT_KMS; + + if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) + return NULL; + + /* base block fetch */ + if (read_edid_block(encoder, block, 0)) + goto fail; + + if (!drm_edid_block_valid(block, 0, print_bad_edid)) + goto fail; + + /* if there's no extensions, we're done */ + if (block[0x7e] == 0) + return block; + + new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL); + if (!new) + goto fail; + block = new; + + for (j = 1; j <= block[0x7e]; j++) { + uint8_t *ext_block = block + (valid_extensions + 1) * EDID_LENGTH; + if (read_edid_block(encoder, ext_block, j)) + goto fail; + + if (!drm_edid_block_valid(ext_block, j, print_bad_edid)) + goto fail; + + valid_extensions++; + } + + if (valid_extensions != block[0x7e]) { + block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; + block[0x7e] = valid_extensions; + new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL); + if (!new) + goto fail; + block = new; + } + + return block; + +fail: + dev_warn(encoder->dev->dev, "failed to read EDID\n"); + kfree(block); + return NULL; +} + +static int +tda998x_encoder_get_modes(struct drm_encoder *encoder, + struct drm_connector *connector) +{ + struct edid *edid = (struct edid *)do_get_edid(encoder); + int n = 0; + + if (edid) { + drm_mode_connector_update_edid_property(connector, edid); + n = drm_add_edid_modes(connector, edid); + kfree(edid); + } + + return n; +} + +static int +tda998x_encoder_create_resources(struct drm_encoder *encoder, + struct drm_connector *connector) +{ + DBG(""); + return 0; +} + +static int +tda998x_encoder_set_property(struct drm_encoder *encoder, + struct drm_connector *connector, + struct drm_property *property, + uint64_t val) +{ + DBG(""); + return 0; +} + +static void +tda998x_encoder_destroy(struct drm_encoder *encoder) +{ + struct tda998x_priv *priv = to_tda998x_priv(encoder); + drm_i2c_encoder_destroy(encoder); + kfree(priv); +} + +static struct drm_encoder_slave_funcs tda998x_encoder_funcs = { + .set_config = tda998x_encoder_set_config, + .destroy = tda998x_encoder_destroy, + .dpms = tda998x_encoder_dpms, + .save = tda998x_encoder_save, + .restore = tda998x_encoder_restore, + .mode_fixup = tda998x_encoder_mode_fixup, + .mode_valid = tda998x_encoder_mode_valid, + .mode_set = tda998x_encoder_mode_set, + .detect = tda998x_encoder_detect, + .get_modes = tda998x_encoder_get_modes, + .create_resources = tda998x_encoder_create_resources, + .set_property = tda998x_encoder_set_property, +}; + +/* I2C driver functions */ + +static int +tda998x_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + return 0; +} + +static int +tda998x_remove(struct i2c_client *client) +{ + return 0; +} + +static int +tda998x_encoder_init(struct i2c_client *client, + struct drm_device *dev, + struct drm_encoder_slave *encoder_slave) +{ + struct drm_encoder *encoder = &encoder_slave->base; + struct tda998x_priv *priv; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->current_page = 0; + priv->cec = i2c_new_dummy(client->adapter, 0x34); + priv->dpms = DRM_MODE_DPMS_OFF; + + encoder_slave->slave_priv = priv; + encoder_slave->slave_funcs = &tda998x_encoder_funcs; + + /* wake up the device: */ + cec_write(encoder, REG_CEC_ENAMODS, + CEC_ENAMODS_EN_RXSENS | CEC_ENAMODS_EN_HDMI); + + tda998x_reset(encoder); + + /* read version: */ + priv->rev = reg_read(encoder, REG_VERSION_LSB) | + reg_read(encoder, REG_VERSION_MSB) << 8; + + /* mask off feature bits: */ + priv->rev &= ~0x30; /* not-hdcp and not-scalar bit */ + + switch (priv->rev) { + case TDA9989N2: dev_info(dev->dev, "found TDA9989 n2"); break; + case TDA19989: dev_info(dev->dev, "found TDA19989"); break; + case TDA19989N2: dev_info(dev->dev, "found TDA19989 n2"); break; + case TDA19988: dev_info(dev->dev, "found TDA19988"); break; + default: + DBG("found unsupported device: %04x", priv->rev); + goto fail; + } + + /* after reset, enable DDC: */ + reg_write(encoder, REG_DDC_DISABLE, 0x00); + + /* set clock on DDC channel: */ + reg_write(encoder, REG_TX3, 39); + + /* if necessary, disable multi-master: */ + if (priv->rev == TDA19989) + reg_set(encoder, REG_I2C_MASTER, I2C_MASTER_DIS_MM); + + cec_write(encoder, REG_CEC_FRO_IM_CLK_CTRL, + CEC_FRO_IM_CLK_CTRL_GHOST_DIS | CEC_FRO_IM_CLK_CTRL_IMCLK_SEL); + + return 0; + +fail: + /* if encoder_init fails, the encoder slave is never registered, + * so cleanup here: + */ + if (priv->cec) + i2c_unregister_device(priv->cec); + kfree(priv); + encoder_slave->slave_priv = NULL; + encoder_slave->slave_funcs = NULL; + return -ENXIO; +} + +static struct i2c_device_id tda998x_ids[] = { + { "tda998x", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, tda998x_ids); + +static struct drm_i2c_encoder_driver tda998x_driver = { + .i2c_driver = { + .probe = tda998x_probe, + .remove = tda998x_remove, + .driver = { + .name = "tda998x", + }, + .id_table = tda998x_ids, + }, + .encoder_init = tda998x_encoder_init, +}; + +/* Module initialization */ + +static int __init +tda998x_init(void) +{ + DBG(""); + return drm_i2c_encoder_register(THIS_MODULE, &tda998x_driver); +} + +static void __exit +tda998x_exit(void) +{ + DBG(""); + drm_i2c_encoder_unregister(&tda998x_driver); +} + +MODULE_AUTHOR("Rob Clark <robdclark@gmail.com"); +MODULE_DESCRIPTION("NXP Semiconductors TDA998X HDMI Encoder"); +MODULE_LICENSE("GPL"); + +module_init(tda998x_init); +module_exit(tda998x_exit);