linux-kernel - Re: [PATCH v1 2/2] drm/stm: ltdc: remove non-alpha color formats on layer 2 for older hw

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Date:   Thu, 8 Feb 2018 10:40:52 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     Yannick FERTRE <yannick.fertre@...com>
Cc:     Philippe CORNU <philippe.cornu@...com>,
        Vincent ABRIOU <vincent.abriou@...com>,
        David Airlie <airlied@...ux.ie>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Fabien DESSENNE <fabien.dessenne@...com>,
        Mickael REULIER <mickael.reulier@...com>,
        Alexandre TORGUE <alexandre.torgue@...com>
Subject: Re: [PATCH v1 2/2] drm/stm: ltdc: remove non-alpha color formats on
 layer 2 for older hw

2018-02-06 10:13 GMT+01:00 Yannick FERTRE <yannick.fertre@...com>:
> Reviewed-by: Yannick Fertré <yannick.fertre@...com>
>
>
> On 02/01/2018 11:42 AM, Philippe Cornu wrote:
>> Hw older versions support non-alpha color formats derived
>> from native alpha color formats only on the primary layer.
>> For instance, RG16 native format without alpha works fine
>> on 2nd layer but XR24 (derived color format from AR24)
>> does not work on 2nd layer.
>>
>> Signed-off-by: Philippe Cornu <philippe.cornu@...com>

Applied on drm-misc-next

Benjamin

>> ---
>>   drivers/gpu/drm/stm/ltdc.c | 20 ++++++++++++++++++++
>>   drivers/gpu/drm/stm/ltdc.h |  1 +
>>   2 files changed, 21 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
>> index f6f26fc0ae9e..1a3277e483d5 100644
>> --- a/drivers/gpu/drm/stm/ltdc.c
>> +++ b/drivers/gpu/drm/stm/ltdc.c
>> @@ -703,6 +703,11 @@ static void ltdc_plane_atomic_update(struct drm_plane *plane,
>>       if (!fb->format->has_alpha)
>>               val = BF1_CA | BF2_1CA;
>>
>> +     /* Manage hw-specific capabilities */
>> +     if (ldev->caps.non_alpha_only_l1 &&
>> +         plane->type != DRM_PLANE_TYPE_PRIMARY)
>> +             val = BF1_PAXCA | BF2_1PAXCA;
>> +
>>       reg_update_bits(ldev->regs, LTDC_L1BFCR + lofs,
>>                       LXBFCR_BF2 | LXBFCR_BF1, val);
>>
>> @@ -785,6 +790,12 @@ static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
>>               drm_fmt_no_alpha = get_pixelformat_without_alpha(drm_fmt);
>>               if (!drm_fmt_no_alpha)
>>                       continue;
>> +
>> +             /* Manage hw-specific capabilities */
>> +             if (ldev->caps.non_alpha_only_l1 &&
>> +                 type != DRM_PLANE_TYPE_PRIMARY)
>> +                     continue;
>> +
>>               formats[nb_fmt++] = drm_fmt_no_alpha;
>>       }
>>
>> @@ -913,10 +924,19 @@ static int ltdc_get_caps(struct drm_device *ddev)
>>       case HWVER_10300:
>>               ldev->caps.reg_ofs = REG_OFS_NONE;
>>               ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a0;
>> +             /*
>> +              * Hw older versions support non-alpha color formats derived
>> +              * from native alpha color formats only on the primary layer.
>> +              * For instance, RG16 native format without alpha works fine
>> +              * on 2nd layer but XR24 (derived color format from AR24)
>> +              * does not work on 2nd layer.
>> +              */
>> +             ldev->caps.non_alpha_only_l1 = true;
>>               break;
>>       case HWVER_20101:
>>               ldev->caps.reg_ofs = REG_OFS_4;
>>               ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a1;
>> +             ldev->caps.non_alpha_only_l1 = false;
>>               break;
>>       default:
>>               return -ENODEV;
>> diff --git a/drivers/gpu/drm/stm/ltdc.h b/drivers/gpu/drm/stm/ltdc.h
>> index edd1c0a446d1..edb268129c54 100644
>> --- a/drivers/gpu/drm/stm/ltdc.h
>> +++ b/drivers/gpu/drm/stm/ltdc.h
>> @@ -17,6 +17,7 @@ struct ltdc_caps {
>>       u32 reg_ofs;            /* register offset for applicable regs */
>>       u32 bus_width;          /* bus width (32 or 64 bits) */
>>       const u32 *pix_fmt_hw;  /* supported pixel formats */
>> +     bool non_alpha_only_l1; /* non-native no-alpha formats on layer 1 */
>>   };
>>
>>   struct ltdc_device {