| Message ID | 01e5dae1-d4b0-cf31-516b-423b11b077f1@axentia.se (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | dmaengine: at_hdmac: Regression fix and cleanup | expand |
On 5/23/23 18:20, Peter Rosin wrote: > The MSB part of the peripheral IDs need to go into the ATC_SRC_PER_MSB > and ATC_DST_PER_MSB fields. Not the LSB part. > > This fixes a severe regression for TSE-850 devices (compatible > axentia,tse850v3) where output to the audio I2S codec (the main > purpose of the device) simply do not work. > > Fixes: d8840a7edcf0 ("dmaengine: at_hdmac: Use bitfield access macros") > Cc: stable@vger.kernel.org > Signed-off-by: Peter Rosin <peda@axentia.se> Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org> > --- > drivers/dma/at_hdmac.c | 15 +++++++++------ > 1 file changed, 9 insertions(+), 6 deletions(-) > > diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c > index 8858470246e1..6362013b90df 100644 > --- a/drivers/dma/at_hdmac.c > +++ b/drivers/dma/at_hdmac.c > @@ -153,8 +153,6 @@ > #define ATC_AUTO BIT(31) /* Auto multiple buffer tx enable */ > > /* Bitfields in CFG */ > -#define ATC_PER_MSB(h) ((0x30U & (h)) >> 4) /* Extract most significant bits of a handshaking identifier */ > - > #define ATC_SRC_PER GENMASK(3, 0) /* Channel src rq associated with periph handshaking ifc h */ > #define ATC_DST_PER GENMASK(7, 4) /* Channel dst rq associated with periph handshaking ifc h */ > #define ATC_SRC_REP BIT(8) /* Source Replay Mod */ > @@ -181,10 +179,15 @@ > #define ATC_DPIP_HOLE GENMASK(15, 0) > #define ATC_DPIP_BOUNDARY GENMASK(25, 16) > > -#define ATC_SRC_PER_ID(id) (FIELD_PREP(ATC_SRC_PER_MSB, (id)) | \ > - FIELD_PREP(ATC_SRC_PER, (id))) > -#define ATC_DST_PER_ID(id) (FIELD_PREP(ATC_DST_PER_MSB, (id)) | \ > - FIELD_PREP(ATC_DST_PER, (id))) > +#define ATC_PER_MSB GENMASK(5, 4) /* Extract MSBs of a handshaking identifier */ > +#define ATC_SRC_PER_ID(id) \ > + ({ typeof(id) _id = (id); \ > + FIELD_PREP(ATC_SRC_PER_MSB, FIELD_GET(ATC_PER_MSB, _id)) | \ > + FIELD_PREP(ATC_SRC_PER, _id); }) > +#define ATC_DST_PER_ID(id) \ > + ({ typeof(id) _id = (id); \ > + FIELD_PREP(ATC_DST_PER_MSB, FIELD_GET(ATC_PER_MSB, _id)) | \ > + FIELD_PREP(ATC_DST_PER, _id); }) > > >
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index 8858470246e1..6362013b90df 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -153,8 +153,6 @@ #define ATC_AUTO BIT(31) /* Auto multiple buffer tx enable */ /* Bitfields in CFG */ -#define ATC_PER_MSB(h) ((0x30U & (h)) >> 4) /* Extract most significant bits of a handshaking identifier */ - #define ATC_SRC_PER GENMASK(3, 0) /* Channel src rq associated with periph handshaking ifc h */ #define ATC_DST_PER GENMASK(7, 4) /* Channel dst rq associated with periph handshaking ifc h */ #define ATC_SRC_REP BIT(8) /* Source Replay Mod */ @@ -181,10 +179,15 @@ #define ATC_DPIP_HOLE GENMASK(15, 0) #define ATC_DPIP_BOUNDARY GENMASK(25, 16) -#define ATC_SRC_PER_ID(id) (FIELD_PREP(ATC_SRC_PER_MSB, (id)) | \ - FIELD_PREP(ATC_SRC_PER, (id))) -#define ATC_DST_PER_ID(id) (FIELD_PREP(ATC_DST_PER_MSB, (id)) | \ - FIELD_PREP(ATC_DST_PER, (id))) +#define ATC_PER_MSB GENMASK(5, 4) /* Extract MSBs of a handshaking identifier */ +#define ATC_SRC_PER_ID(id) \ + ({ typeof(id) _id = (id); \ + FIELD_PREP(ATC_SRC_PER_MSB, FIELD_GET(ATC_PER_MSB, _id)) | \ + FIELD_PREP(ATC_SRC_PER, _id); }) +#define ATC_DST_PER_ID(id) \ + ({ typeof(id) _id = (id); \ + FIELD_PREP(ATC_DST_PER_MSB, FIELD_GET(ATC_PER_MSB, _id)) | \ + FIELD_PREP(ATC_DST_PER, _id); })
The MSB part of the peripheral IDs need to go into the ATC_SRC_PER_MSB and ATC_DST_PER_MSB fields. Not the LSB part. This fixes a severe regression for TSE-850 devices (compatible axentia,tse850v3) where output to the audio I2S codec (the main purpose of the device) simply do not work. Fixes: d8840a7edcf0 ("dmaengine: at_hdmac: Use bitfield access macros") Cc: stable@vger.kernel.org Signed-off-by: Peter Rosin <peda@axentia.se> --- drivers/dma/at_hdmac.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-)