Messages in this thread | | | Date | Thu, 14 Jul 2022 13:12:43 +0200 | Subject | Re: [PATCH v14 03/10] drm/edid: Add cea_sad helpers for freq/length | From | AngeloGioacchino Del Regno <> |
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Il 12/07/22 13:12, Bo-Chen Chen ha scritto: > 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. > > 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 | 73 ++++++++++++++++++++++++++++++++++++++ > include/drm/drm_edid.h | 14 ++++++++ > 2 files changed, 87 insertions(+) > > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c > index bc43e1b32092..79316d7f1fd8 100644 > --- a/drivers/gpu/drm/drm_edid.c > +++ b/drivers/gpu/drm/drm_edid.c > @@ -4916,6 +4916,79 @@ 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); > + > +static bool drm_cea_sad_is_pcm(const struct cea_sad *sad) > +{ > + switch (sad->format) { > + case HDMI_AUDIO_CODING_TYPE_PCM: > + return true; > + default: > + return false; > + }
Are you sure that you need this helper? That's used only in one function... ...if you really need this one, though, I don't think that using a switch is the best option here.
Unless anyone is against that (please, reason?), I would be for doing it like:
return sad->format == HDMI_AUDIO_CODING_TYPE_PCM;
Everything else looks good to me (and working, too).
Cheers, Angelo
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