Reviewed-by: Yannick Fertré <yannick.fertre@xxxxxx>
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@xxxxxx>
> ---
> 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 {
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