| Message ID | 20250109150310.219442-14-tzimmermann@suse.de (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | drm/dumb-buffers: Fix and improve buffer-size calculation | expand |
On Thu, Jan 09, 2025 at 03:57:07PM +0100, Thomas Zimmermann wrote: > Call drm_mode_size_dumb() to compute dumb-buffer scanline pitch and > buffer size. The hardware requires the scnaline pitch to be a multiple > of 32 pixels. Therefore compute the byte size of 32 pixels in the given > color mode and align the pitch accordingly. - scanline, not scnaline - the statement about 32-pixel alignment needs an explanation that it is being currently handled by align_pitch(). With that in mind: Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> > Cc: Rob Clark <robdclark@gmail.com> > Cc: Abhinav Kumar <quic_abhinavk@quicinc.com> > Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > Cc: Sean Paul <sean@poorly.run> > Cc: Marijn Suijten <marijn.suijten@somainline.org> > --- > drivers/gpu/drm/msm/msm_gem.c | 27 +++++++++++++++++++++++++-- > 1 file changed, 25 insertions(+), 2 deletions(-) >
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index ebc9ba66efb8..a956905f1ef2 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -11,8 +11,10 @@ #include <linux/dma-buf.h> #include <linux/pfn_t.h> +#include <drm/drm_dumb_buffers.h> #include <drm/drm_prime.h> #include <drm/drm_file.h> +#include <drm/drm_fourcc.h> #include <trace/events/gpu_mem.h> @@ -700,8 +702,29 @@ void msm_gem_unpin_iova(struct drm_gem_object *obj, int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev, struct drm_mode_create_dumb *args) { - args->pitch = align_pitch(args->width, args->bpp); - args->size = PAGE_ALIGN(args->pitch * args->height); + u32 fourcc; + const struct drm_format_info *info; + u64 pitch_align; + int ret; + + /* + * Adreno needs pitch aligned to 32 pixels. Compute the number + * of bytes for a block of 32 pixels at the given color format. + * Use the result as pitch alignment. + */ + fourcc = drm_driver_color_mode_format(dev, args->bpp); + if (fourcc == DRM_FORMAT_INVALID) + return -EINVAL; + info = drm_format_info(fourcc); + if (!info) + return -EINVAL; + pitch_align = drm_format_info_min_pitch(info, 0, SZ_32); + if (!pitch_align || pitch_align > U32_MAX) + return -EINVAL; + ret = drm_mode_size_dumb(dev, args, pitch_align, 0); + if (ret) + return ret; + return msm_gem_new_handle(dev, file, args->size, MSM_BO_SCANOUT | MSM_BO_WC, &args->handle, "dumb"); }
Call drm_mode_size_dumb() to compute dumb-buffer scanline pitch and buffer size. The hardware requires the scnaline pitch to be a multiple of 32 pixels. Therefore compute the byte size of 32 pixels in the given color mode and align the pitch accordingly. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Cc: Rob Clark <robdclark@gmail.com> Cc: Abhinav Kumar <quic_abhinavk@quicinc.com> Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Cc: Sean Paul <sean@poorly.run> Cc: Marijn Suijten <marijn.suijten@somainline.org> --- drivers/gpu/drm/msm/msm_gem.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-)