2018-02-06 10:12 GMT+01:00 Yannick FERTRE <yannick.fertre@xxxxxx>:
> Reviewed-by: Yannick Fertré <yannick.fertre@xxxxxx>
>
>
> On 02/01/2018 11:42 AM, Philippe Cornu wrote:
>> ltdc supports natively some color formats with alpha (like
>> ARGB8888, ARGB1555, ARGB4444...). Related non-alpha formats are
>> supported too (ARGB8888->XRGB8888, ARGB4444->XRGB4444...) by
>> adjusting ltdc blending factors.
>>
>> Note: Wayland/Weston requests by default the non-alpha XRGB8888
>> color format.
>>
>> Signed-off-by: Philippe Cornu <philippe.cornu@xxxxxx>
Applied on drm-misc-next
Benjamin
>> ---
>> drivers/gpu/drm/stm/ltdc.c | 33 +++++++++++++++++++++++++++++++--
>> 1 file changed, 31 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
>> index 90b3de516c91..f6f26fc0ae9e 100644
>> --- a/drivers/gpu/drm/stm/ltdc.c
>> +++ b/drivers/gpu/drm/stm/ltdc.c
>> @@ -328,6 +328,26 @@ static inline u32 to_drm_pixelformat(enum ltdc_pix_fmt pf)
>> }
>> }
>>
>> +static inline u32 get_pixelformat_without_alpha(u32 drm)
>> +{
>> + switch (drm) {
>> + case DRM_FORMAT_ARGB4444:
>> + return DRM_FORMAT_XRGB4444;
>> + case DRM_FORMAT_RGBA4444:
>> + return DRM_FORMAT_RGBX4444;
>> + case DRM_FORMAT_ARGB1555:
>> + return DRM_FORMAT_XRGB1555;
>> + case DRM_FORMAT_RGBA5551:
>> + return DRM_FORMAT_RGBX5551;
>> + case DRM_FORMAT_ARGB8888:
>> + return DRM_FORMAT_XRGB8888;
>> + case DRM_FORMAT_RGBA8888:
>> + return DRM_FORMAT_RGBX8888;
>> + default:
>> + return 0;
>> + }
>> +}
>> +
>> static irqreturn_t ltdc_irq_thread(int irq, void *arg)
>> {
>> struct drm_device *ddev = arg;
>> @@ -680,6 +700,9 @@ static void ltdc_plane_atomic_update(struct drm_plane *plane,
>>
>> /* Specifies the blending factors */
>> val = BF1_PAXCA | BF2_1PAXCA;
>> + if (!fb->format->has_alpha)
>> + val = BF1_CA | BF2_1CA;
>> +
>> reg_update_bits(ldev->regs, LTDC_L1BFCR + lofs,
>> LXBFCR_BF2 | LXBFCR_BF1, val);
>>
>> @@ -747,8 +770,8 @@ static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
>> struct device *dev = ddev->dev;
>> struct drm_plane *plane;
>> unsigned int i, nb_fmt = 0;
>> - u32 formats[NB_PF];
>> - u32 drm_fmt;
>> + u32 formats[NB_PF * 2];
>> + u32 drm_fmt, drm_fmt_no_alpha;
>> int ret;
>>
>> /* Get supported pixel formats */
>> @@ -757,6 +780,12 @@ static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
>> if (!drm_fmt)
>> continue;
>> formats[nb_fmt++] = drm_fmt;
>> +
>> + /* Add the no-alpha related format if any & supported */
>> + drm_fmt_no_alpha = get_pixelformat_without_alpha(drm_fmt);
>> + if (!drm_fmt_no_alpha)
>> + continue;
>> + formats[nb_fmt++] = drm_fmt_no_alpha;
>> }
>>
>> plane = devm_kzalloc(dev, sizeof(*plane), GFP_KERNEL);
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