Re: [PATCH v15 03/11] drm/edid: Add cea_sad helpers for freq/length
On Fri, 05 Aug 2022, Rex-BC Chen wrote: > On Tue, 2022-08-02 at 17:11 +0300, Jani Nikula wrote: >> On Wed, 27 Jul 2022, Bo-Chen Chen wrote: >> > From: Guillaume Ranquet >> > >> > 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 >> > Signed-off-by: Guillaume Ranquet >> > Signed-off-by: Bo-Chen Chen >> > --- >> > 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) >> > +
Re: [PATCH v15 03/11] drm/edid: Add cea_sad helpers for freq/length
On Wed, 27 Jul 2022, Bo-Chen Chen wrote: > From: Guillaume Ranquet > > 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. > > Signed-off-by: Markus Schneider-Pargmann > Signed-off-by: Guillaume Ranquet > Signed-off-by: Bo-Chen Chen > --- > 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); -- Jani Nikula, Intel Open Source Graphics Center
Re: [PATCH v15 03/11] drm/edid: Add cea_sad helpers for freq/length
Il 27/07/22 06:50, Bo-Chen Chen ha scritto: From: Guillaume Ranquet 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. Signed-off-by: Markus Schneider-Pargmann Signed-off-by: Guillaume Ranquet Signed-off-by: Bo-Chen Chen Reviewed-by: AngeloGioacchino Del Regno