drm/tilcdc: Write DMA base and ceiling address with single instruction

Write DMA base and ceiling address with a single instruction, if
available. This should make it more unlikely that LCDC would fetch the
DMA addresses in the middle of an update. Having bad combination of
addresses in dma base and ceiling (e.g base > ceiling) can cause
unpredictaple behavior in LCDC.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Jyri Sarha 2016-08-26 15:10:14 +03:00
parent 63b07a8d81
commit 7eb9f069ff
2 changed files with 22 additions and 2 deletions

View File

@ -69,6 +69,7 @@ static void set_scanout(struct drm_crtc *crtc, struct drm_framebuffer *fb)
struct drm_gem_cma_object *gem;
unsigned int depth, bpp;
dma_addr_t start, end;
u64 dma_base_and_ceiling;
drm_fb_get_bpp_depth(fb->pixel_format, &depth, &bpp);
gem = drm_fb_cma_get_gem_obj(fb, 0);
@ -79,8 +80,13 @@ static void set_scanout(struct drm_crtc *crtc, struct drm_framebuffer *fb)
end = start + (crtc->mode.vdisplay * fb->pitches[0]);
tilcdc_write(dev, LCDC_DMA_FB_BASE_ADDR_0_REG, start);
tilcdc_write(dev, LCDC_DMA_FB_CEILING_ADDR_0_REG, end - 1);
/* Write LCDC_DMA_FB_BASE_ADDR_0_REG and LCDC_DMA_FB_CEILING_ADDR_0_REG
* with a single insruction, if available. This should make it more
* unlikely that LCDC would fetch the DMA addresses in the middle of
* an update.
*/
dma_base_and_ceiling = (u64)(end - 1) << 32 | start;
tilcdc_write64(dev, LCDC_DMA_FB_BASE_ADDR_0_REG, dma_base_and_ceiling);
if (tilcdc_crtc->curr_fb)
drm_flip_work_queue(&tilcdc_crtc->unref_work,

View File

@ -119,6 +119,20 @@ static inline void tilcdc_write(struct drm_device *dev, u32 reg, u32 data)
iowrite32(data, priv->mmio + reg);
}
static inline void tilcdc_write64(struct drm_device *dev, u32 reg, u64 data)
{
struct tilcdc_drm_private *priv = dev->dev_private;
volatile void __iomem *addr = priv->mmio + reg;
#ifdef iowrite64
iowrite64(data, addr);
#else
__iowmb();
/* This compiles to strd (=64-bit write) on ARM7 */
*(volatile u64 __force *)addr = __cpu_to_le64(data);
#endif
}
static inline u32 tilcdc_read(struct drm_device *dev, u32 reg)
{
struct tilcdc_drm_private *priv = dev->dev_private;