| Message ID | 20220727045035.32225-4-rex-bc.chen@mediatek.com |
|---|---|
| State | New |
| Headers | show |
| Series | drm/mediatek: Add MT8195 DisplayPort driver | expand |
On Tue, 2022-08-02 at 17:11 +0300, Jani Nikula wrote: > On Wed, 27 Jul 2022, Bo-Chen Chen <rex-bc.chen@mediatek.com> wrote: > > From: Guillaume Ranquet <granquet@baylibre.com> > > > > This patch adds two helper functions that extract the frequency and > > word > > length from a struct cea_sad. > > > > For these helper functions new defines are added that help > > translate the > > 'freq' and 'byte2' fields into real numbers. > > I think we should stop adding a plethora of functions that deal with > sads like this. > > There should probably be *one* struct that contains all the details > you > and everyone need extracted. There should be *one* function that > fills > in all the details. The struct should be placed in > connector->display_info, and the function should be called *once* > from > update_display_info(). > > Ideally, the function shouldn't even be exposed from drm_edid.c, but > if > you still need to deal with situations where you don't call connector > update, maybe it needs to be exposed. > > BR, > Jani. > > Hello Jani, Thanks for your review. After checking our patches, we found we will not use these two function because we remove them in patch [11/11] drm/mediatek: Use cached audio config when changing resolution. I will drop [02/11] and [03/11]. Thanks! BRs, Bo-Chen > > > > Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com> > > Signed-off-by: Guillaume Ranquet <granquet@baylibre.com> > > Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com> > > --- > > drivers/gpu/drm/drm_edid.c | 63 > > ++++++++++++++++++++++++++++++++++++++ > > include/drm/drm_edid.h | 14 +++++++++ > > 2 files changed, 77 insertions(+) > > > > diff --git a/drivers/gpu/drm/drm_edid.c > > b/drivers/gpu/drm/drm_edid.c > > index bc43e1b32092..2a6f92da5ff3 100644 > > --- a/drivers/gpu/drm/drm_edid.c > > +++ b/drivers/gpu/drm/drm_edid.c > > @@ -4916,6 +4916,69 @@ int drm_edid_to_speaker_allocation(const > > struct edid *edid, u8 **sadb) > > } > > EXPORT_SYMBOL(drm_edid_to_speaker_allocation); > > > > +/** > > + * drm_cea_sad_get_sample_rate - Extract the sample rate from > > cea_sad > > + * @sad: Pointer to the cea_sad struct > > + * > > + * Extracts the cea_sad frequency field and returns the sample > > rate in Hz. > > + * > > + * Return: Sample rate in Hz or a negative errno if parsing > > failed. > > + */ > > +int drm_cea_sad_get_sample_rate(const struct cea_sad *sad) > > +{ > > + switch (sad->freq) { > > + case DRM_CEA_SAD_FREQ_32KHZ: > > + return 32000; > > + case DRM_CEA_SAD_FREQ_44KHZ: > > + return 44100; > > + case DRM_CEA_SAD_FREQ_48KHZ: > > + return 48000; > > + case DRM_CEA_SAD_FREQ_88KHZ: > > + return 88200; > > + case DRM_CEA_SAD_FREQ_96KHZ: > > + return 96000; > > + case DRM_CEA_SAD_FREQ_176KHZ: > > + return 176400; > > + case DRM_CEA_SAD_FREQ_192KHZ: > > + return 192000; > > + default: > > + return -EINVAL; > > + } > > +} > > +EXPORT_SYMBOL(drm_cea_sad_get_sample_rate); > > + > > +/** > > + * drm_cea_sad_get_uncompressed_word_length - Extract word length > > + * @sad: Pointer to the cea_sad struct > > + * > > + * Extracts the cea_sad byte2 field and returns the word length > > for an > > + * uncompressed stream. > > + * > > + * Note: This function may only be called for uncompressed audio. > > + * > > + * Return: Word length in bits or a negative errno if parsing > > failed. > > + */ > > +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad > > *sad) > > +{ > > + if (sad->format != HDMI_AUDIO_CODING_TYPE_PCM) { > > + DRM_WARN("Unable to get the uncompressed word length > > for format: %u\n", > > + sad->format); > > + return -EINVAL; > > + } > > + > > + switch (sad->byte2) { > > + case DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT: > > + return 16; > > + case DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT: > > + return 20; > > + case DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT: > > + return 24; > > + default: > > + return -EINVAL; > > + } > > +} > > +EXPORT_SYMBOL(drm_cea_sad_get_uncompressed_word_length); > > + > > /** > > * drm_av_sync_delay - compute the HDMI/DP sink audio-video sync > > delay > > * @connector: connector associated with the HDMI/DP sink > > diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h > > index c2c43a4af681..779b710aed40 100644 > > --- a/include/drm/drm_edid.h > > +++ b/include/drm/drm_edid.h > > @@ -373,6 +373,18 @@ struct cea_sad { > > u8 byte2; > > }; > > > > +#define DRM_CEA_SAD_FREQ_32KHZ BIT(0) > > +#define DRM_CEA_SAD_FREQ_44KHZ BIT(1) > > +#define DRM_CEA_SAD_FREQ_48KHZ BIT(2) > > +#define DRM_CEA_SAD_FREQ_88KHZ BIT(3) > > +#define DRM_CEA_SAD_FREQ_96KHZ BIT(4) > > +#define DRM_CEA_SAD_FREQ_176KHZ BIT(5) > > +#define DRM_CEA_SAD_FREQ_192KHZ BIT(6) > > + > > +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT BIT(0) > > +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT BIT(1) > > +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT BIT(2) > > + > > struct drm_encoder; > > struct drm_connector; > > struct drm_connector_state; > > @@ -380,6 +392,8 @@ struct drm_display_mode; > > > > int drm_edid_to_sad(const struct edid *edid, struct cea_sad > > **sads); > > int drm_edid_to_speaker_allocation(const struct edid *edid, u8 > > **sadb); > > +int drm_cea_sad_get_sample_rate(const struct cea_sad *sad); > > +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad > > *sad); > > int drm_av_sync_delay(struct drm_connector *connector, > > const struct drm_display_mode *mode); > >
On Fri, 05 Aug 2022, Rex-BC Chen <rex-bc.chen@mediatek.com> wrote: > On Tue, 2022-08-02 at 17:11 +0300, Jani Nikula wrote: >> On Wed, 27 Jul 2022, Bo-Chen Chen <rex-bc.chen@mediatek.com> wrote: >> > From: Guillaume Ranquet <granquet@baylibre.com> >> > >> > This patch adds two helper functions that extract the frequency and >> > word >> > length from a struct cea_sad. >> > >> > For these helper functions new defines are added that help >> > translate the >> > 'freq' and 'byte2' fields into real numbers. >> >> I think we should stop adding a plethora of functions that deal with >> sads like this. >> >> There should probably be *one* struct that contains all the details >> you >> and everyone need extracted. There should be *one* function that >> fills >> in all the details. The struct should be placed in >> connector->display_info, and the function should be called *once* >> from >> update_display_info(). >> >> Ideally, the function shouldn't even be exposed from drm_edid.c, but >> if >> you still need to deal with situations where you don't call connector >> update, maybe it needs to be exposed. >> >> BR, >> Jani. >> >> > > Hello Jani, > > Thanks for your review. > After checking our patches, we found we will not use these two function > because we remove them in patch [11/11] drm/mediatek: Use cached audio > config when changing resolution. > > I will drop [02/11] and [03/11]. > > Thanks! Thank you too! :) BR, Jani. > > BRs, > Bo-Chen > >> > >> > Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com> >> > Signed-off-by: Guillaume Ranquet <granquet@baylibre.com> >> > Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com> >> > --- >> > drivers/gpu/drm/drm_edid.c | 63 >> > ++++++++++++++++++++++++++++++++++++++ >> > include/drm/drm_edid.h | 14 +++++++++ >> > 2 files changed, 77 insertions(+) >> > >> > diff --git a/drivers/gpu/drm/drm_edid.c >> > b/drivers/gpu/drm/drm_edid.c >> > index bc43e1b32092..2a6f92da5ff3 100644 >> > --- a/drivers/gpu/drm/drm_edid.c >> > +++ b/drivers/gpu/drm/drm_edid.c >> > @@ -4916,6 +4916,69 @@ int drm_edid_to_speaker_allocation(const >> > struct edid *edid, u8 **sadb) >> > } >> > EXPORT_SYMBOL(drm_edid_to_speaker_allocation); >> > >> > +/** >> > + * drm_cea_sad_get_sample_rate - Extract the sample rate from >> > cea_sad >> > + * @sad: Pointer to the cea_sad struct >> > + * >> > + * Extracts the cea_sad frequency field and returns the sample >> > rate in Hz. >> > + * >> > + * Return: Sample rate in Hz or a negative errno if parsing >> > failed. >> > + */ >> > +int drm_cea_sad_get_sample_rate(const struct cea_sad *sad) >> > +{ >> > + switch (sad->freq) { >> > + case DRM_CEA_SAD_FREQ_32KHZ: >> > + return 32000; >> > + case DRM_CEA_SAD_FREQ_44KHZ: >> > + return 44100; >> > + case DRM_CEA_SAD_FREQ_48KHZ: >> > + return 48000; >> > + case DRM_CEA_SAD_FREQ_88KHZ: >> > + return 88200; >> > + case DRM_CEA_SAD_FREQ_96KHZ: >> > + return 96000; >> > + case DRM_CEA_SAD_FREQ_176KHZ: >> > + return 176400; >> > + case DRM_CEA_SAD_FREQ_192KHZ: >> > + return 192000; >> > + default: >> > + return -EINVAL; >> > + } >> > +} >> > +EXPORT_SYMBOL(drm_cea_sad_get_sample_rate); >> > + >> > +/** >> > + * drm_cea_sad_get_uncompressed_word_length - Extract word length >> > + * @sad: Pointer to the cea_sad struct >> > + * >> > + * Extracts the cea_sad byte2 field and returns the word length >> > for an >> > + * uncompressed stream. >> > + * >> > + * Note: This function may only be called for uncompressed audio. >> > + * >> > + * Return: Word length in bits or a negative errno if parsing >> > failed. >> > + */ >> > +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad >> > *sad) >> > +{ >> > + if (sad->format != HDMI_AUDIO_CODING_TYPE_PCM) { >> > + DRM_WARN("Unable to get the uncompressed word length >> > for format: %u\n", >> > + sad->format); >> > + return -EINVAL; >> > + } >> > + >> > + switch (sad->byte2) { >> > + case DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT: >> > + return 16; >> > + case DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT: >> > + return 20; >> > + case DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT: >> > + return 24; >> > + default: >> > + return -EINVAL; >> > + } >> > +} >> > +EXPORT_SYMBOL(drm_cea_sad_get_uncompressed_word_length); >> > + >> > /** >> > * drm_av_sync_delay - compute the HDMI/DP sink audio-video sync >> > delay >> > * @connector: connector associated with the HDMI/DP sink >> > diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h >> > index c2c43a4af681..779b710aed40 100644 >> > --- a/include/drm/drm_edid.h >> > +++ b/include/drm/drm_edid.h >> > @@ -373,6 +373,18 @@ struct cea_sad { >> > u8 byte2; >> > }; >> > >> > +#define DRM_CEA_SAD_FREQ_32KHZ BIT(0) >> > +#define DRM_CEA_SAD_FREQ_44KHZ BIT(1) >> > +#define DRM_CEA_SAD_FREQ_48KHZ BIT(2) >> > +#define DRM_CEA_SAD_FREQ_88KHZ BIT(3) >> > +#define DRM_CEA_SAD_FREQ_96KHZ BIT(4) >> > +#define DRM_CEA_SAD_FREQ_176KHZ BIT(5) >> > +#define DRM_CEA_SAD_FREQ_192KHZ BIT(6) >> > + >> > +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT BIT(0) >> > +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT BIT(1) >> > +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT BIT(2) >> > + >> > struct drm_encoder; >> > struct drm_connector; >> > struct drm_connector_state; >> > @@ -380,6 +392,8 @@ struct drm_display_mode; >> > >> > int drm_edid_to_sad(const struct edid *edid, struct cea_sad >> > **sads); >> > int drm_edid_to_speaker_allocation(const struct edid *edid, u8 >> > **sadb); >> > +int drm_cea_sad_get_sample_rate(const struct cea_sad *sad); >> > +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad >> > *sad); >> > int drm_av_sync_delay(struct drm_connector *connector, >> > const struct drm_display_mode *mode); >> >> >
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index bc43e1b32092..2a6f92da5ff3 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -4916,6 +4916,69 @@ int drm_edid_to_speaker_allocation(const struct edid *edid, u8 **sadb) } EXPORT_SYMBOL(drm_edid_to_speaker_allocation); +/** + * drm_cea_sad_get_sample_rate - Extract the sample rate from cea_sad + * @sad: Pointer to the cea_sad struct + * + * Extracts the cea_sad frequency field and returns the sample rate in Hz. + * + * Return: Sample rate in Hz or a negative errno if parsing failed. + */ +int drm_cea_sad_get_sample_rate(const struct cea_sad *sad) +{ + switch (sad->freq) { + case DRM_CEA_SAD_FREQ_32KHZ: + return 32000; + case DRM_CEA_SAD_FREQ_44KHZ: + return 44100; + case DRM_CEA_SAD_FREQ_48KHZ: + return 48000; + case DRM_CEA_SAD_FREQ_88KHZ: + return 88200; + case DRM_CEA_SAD_FREQ_96KHZ: + return 96000; + case DRM_CEA_SAD_FREQ_176KHZ: + return 176400; + case DRM_CEA_SAD_FREQ_192KHZ: + return 192000; + default: + return -EINVAL; + } +} +EXPORT_SYMBOL(drm_cea_sad_get_sample_rate); + +/** + * drm_cea_sad_get_uncompressed_word_length - Extract word length + * @sad: Pointer to the cea_sad struct + * + * Extracts the cea_sad byte2 field and returns the word length for an + * uncompressed stream. + * + * Note: This function may only be called for uncompressed audio. + * + * Return: Word length in bits or a negative errno if parsing failed. + */ +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad *sad) +{ + if (sad->format != HDMI_AUDIO_CODING_TYPE_PCM) { + DRM_WARN("Unable to get the uncompressed word length for format: %u\n", + sad->format); + return -EINVAL; + } + + switch (sad->byte2) { + case DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT: + return 16; + case DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT: + return 20; + case DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT: + return 24; + default: + return -EINVAL; + } +} +EXPORT_SYMBOL(drm_cea_sad_get_uncompressed_word_length); + /** * drm_av_sync_delay - compute the HDMI/DP sink audio-video sync delay * @connector: connector associated with the HDMI/DP sink diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h index c2c43a4af681..779b710aed40 100644 --- a/include/drm/drm_edid.h +++ b/include/drm/drm_edid.h @@ -373,6 +373,18 @@ struct cea_sad { u8 byte2; }; +#define DRM_CEA_SAD_FREQ_32KHZ BIT(0) +#define DRM_CEA_SAD_FREQ_44KHZ BIT(1) +#define DRM_CEA_SAD_FREQ_48KHZ BIT(2) +#define DRM_CEA_SAD_FREQ_88KHZ BIT(3) +#define DRM_CEA_SAD_FREQ_96KHZ BIT(4) +#define DRM_CEA_SAD_FREQ_176KHZ BIT(5) +#define DRM_CEA_SAD_FREQ_192KHZ BIT(6) + +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT BIT(0) +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT BIT(1) +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT BIT(2) + struct drm_encoder; struct drm_connector; struct drm_connector_state; @@ -380,6 +392,8 @@ struct drm_display_mode; int drm_edid_to_sad(const struct edid *edid, struct cea_sad **sads); int drm_edid_to_speaker_allocation(const struct edid *edid, u8 **sadb); +int drm_cea_sad_get_sample_rate(const struct cea_sad *sad); +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad *sad); int drm_av_sync_delay(struct drm_connector *connector, const struct drm_display_mode *mode);