| Message ID | 20140109120513.0965ddad@armhf (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Jan 09, 2014 at 12:05:13PM +0100, Jean-Francois Moine wrote: > > Signed-off-by: Jean-Francois Moine <moinejf@free.fr> > --- > drivers/gpu/drm/i2c/tda998x_drv.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c > index f60aef9..8a7d8a2 100644 > --- a/drivers/gpu/drm/i2c/tda998x_drv.c > +++ b/drivers/gpu/drm/i2c/tda998x_drv.c > @@ -220,7 +220,7 @@ struct tda998x_priv { > # 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_NOSC(x) ((x) << 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) > @@ -972,6 +972,11 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder, > } > > div = 148500 / mode->clock; > + if (div != 0) { > + div--; > + if (div > 3) > + div = 3; > + } As the driver currently stands, we know that the clock divider works for the lower resolution modes. So, as things stand, for 74.25MHz modes, we get a divisor of one. Your patch changes this, the divider becomes zero. I wonder whether you've tested 720p modes at all with this?
On Sat, 11 Jan 2014 18:26:02 +0000 Russell King - ARM Linux <linux@arm.linux.org.uk> wrote: > > div = 148500 / mode->clock; > > + if (div != 0) { > > + div--; > > + if (div > 3) > > + div = 3; > > + } > > As the driver currently stands, we know that the clock divider works for > the lower resolution modes. So, as things stand, for 74.25MHz modes, > we get a divisor of one. > > Your patch changes this, the divider becomes zero. I wonder whether > you've tested 720p modes at all with this? In 720p, the divider becomes (148500 / 74250 - 1) = 1 and this mode works fine.
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c index f60aef9..8a7d8a2 100644 --- a/drivers/gpu/drm/i2c/tda998x_drv.c +++ b/drivers/gpu/drm/i2c/tda998x_drv.c @@ -220,7 +220,7 @@ struct tda998x_priv { # 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_NOSC(x) ((x) << 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) @@ -972,6 +972,11 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder, } div = 148500 / mode->clock; + if (div != 0) { + div--; + if (div > 3) + div = 3; + } /* mute the audio FIFO: */ reg_set(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_FIFO);
Signed-off-by: Jean-Francois Moine <moinejf@free.fr> --- drivers/gpu/drm/i2c/tda998x_drv.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)