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Message-ID: <87mtcjnn0t.fsf@intel.com>
Date: Fri, 05 Aug 2022 10:54:26 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Rex-BC Chen <rex-bc.chen@...iatek.com>, chunkuang.hu@...nel.org,
p.zabel@...gutronix.de, daniel@...ll.ch, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, mripard@...nel.org,
tzimmermann@...e.de, matthias.bgg@...il.com, deller@....de,
airlied@...ux.ie
Cc: devicetree@...r.kernel.org, linux-fbdev@...r.kernel.org,
granquet@...libre.com, jitao.shi@...iatek.com,
liangxu.xu@...iatek.com, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, msp@...libre.com,
Project_Global_Chrome_Upstream_Group@...iatek.com,
linux-mediatek@...ts.infradead.org, wenst@...omium.org,
linux-arm-kernel@...ts.infradead.org,
angelogioacchino.delregno@...labora.com
Subject: Re: [PATCH v15 03/11] drm/edid: Add cea_sad helpers for freq/length
On Fri, 05 Aug 2022, Rex-BC Chen <rex-bc.chen@...iatek.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@...iatek.com> wrote:
>> > From: Guillaume Ranquet <granquet@...libre.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@...libre.com>
>> > Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
>> > Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.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);
>>
>>
>
--
Jani Nikula, Intel Open Source Graphics Center
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