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drm/omap: add pin refcounting to omap_framebuffer 

omap_framebuffer_pin() and omap_framebuffer_unpin() are currently
broken, as they cannot be called multiple times (i.e. pin, pin, unpin,
unpin), which is what happens in certain cases. This issue causes the
driver to possibly use 0 as an address for a displayed buffer, leading
to OCP error from DSS.

This patch fixes the issue by adding a simple pin_count, used to track
the number of pins.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2014-09-03 19:25:54 +00:00
parent 3f4d17c4ec
commit f36eb5a899
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/omapdrm/omap_fb.c
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@ -86,6 +86,7 @@ struct plane {
struct omap_framebuffer {
struct drm_framebuffer base;
int pin_count;
const struct format *format;
struct plane planes[4];
};
@ -249,6 +250,11 @@ int omap_framebuffer_pin(struct drm_framebuffer *fb)
struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
int ret, i, n = drm_format_num_planes(fb->pixel_format);
if (omap_fb->pin_count > 0) {
omap_fb->pin_count++;
return 0;
}
for (i = 0; i < n; i++) {
struct plane *plane = &omap_fb->planes[i];
ret = omap_gem_get_paddr(plane->bo, &plane->paddr, true);
@ -257,6 +263,8 @@ int omap_framebuffer_pin(struct drm_framebuffer *fb)
omap_gem_dma_sync(plane->bo, DMA_TO_DEVICE);
}
omap_fb->pin_count++;
return 0;
fail:
@ -275,6 +283,11 @@ int omap_framebuffer_unpin(struct drm_framebuffer *fb)
struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
int ret, i, n = drm_format_num_planes(fb->pixel_format);
omap_fb->pin_count--;
if (omap_fb->pin_count > 0)
return 0;
for (i = 0; i < n; i++) {
struct plane *plane = &omap_fb->planes[i];
ret = omap_gem_put_paddr(plane->bo);