The LCDC revision 2 documentation also mentions the mandatory palette for true color modes. Even if the rev 2 LCDC appears to work just fine without the palette being loaded loading it helps in testing the feature.
Signed-off-by: Jyri Sarha jsarha@ti.com --- drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 90 +++++++++++++++++++----------------- 1 file changed, 47 insertions(+), 43 deletions(-)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c index 1ed65dd..b3edc6d 100644 --- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c +++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c @@ -28,8 +28,8 @@ #include "tilcdc_regs.h"
#define TILCDC_VBLANK_SAFETY_THRESHOLD_US 1000 -#define TILCDC_REV1_PALETTE_SIZE 32 -#define TILCDC_REV1_PALETTE_FIRST_ENTRY 0x4000 +#define TILCDC_PALETTE_SIZE 32 +#define TILCDC_PALETTE_FIRST_ENTRY 0x4000
struct tilcdc_crtc { struct drm_crtc base; @@ -62,7 +62,7 @@ struct tilcdc_crtc { struct work_struct recover_work;
dma_addr_t palette_dma_handle; - void *palette_base; + u16 *palette_base; struct completion palette_loaded; }; #define to_tilcdc_crtc(x) container_of(x, struct tilcdc_crtc, base) @@ -114,23 +114,17 @@ static void set_scanout(struct drm_crtc *crtc, struct drm_framebuffer *fb) }
/* - * The driver currently only supports the RGB565 format for revision 1. For - * 16 bits-per-pixel the palette block is bypassed, but the first 32 bytes of - * the framebuffer are still considered palette. The first 16-bit entry must - * be 0x4000 while all other entries must be zeroed. + * The driver currently only supports only true color formats. For + * true color the palette block is bypassed, but a 32 byte palette + * should still be loaded. The first 16-bit entry must be 0x4000 while + * all other entries must be zeroed. */ static void tilcdc_crtc_load_palette(struct drm_crtc *crtc) { u32 dma_fb_base, dma_fb_ceiling, raster_ctl; - struct tilcdc_crtc *tilcdc_crtc; - struct drm_device *dev; - u16 *first_entry; - - dev = crtc->dev; - tilcdc_crtc = to_tilcdc_crtc(crtc); - first_entry = tilcdc_crtc->palette_base; - - *first_entry = TILCDC_REV1_PALETTE_FIRST_ENTRY; + struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); + struct drm_device *dev = crtc->dev; + struct tilcdc_drm_private *priv = dev->dev_private;
dma_fb_base = tilcdc_read(dev, LCDC_DMA_FB_BASE_ADDR_0_REG); dma_fb_ceiling = tilcdc_read(dev, LCDC_DMA_FB_CEILING_ADDR_0_REG); @@ -140,23 +134,34 @@ static void tilcdc_crtc_load_palette(struct drm_crtc *crtc) tilcdc_write(dev, LCDC_DMA_FB_BASE_ADDR_0_REG, tilcdc_crtc->palette_dma_handle); tilcdc_write(dev, LCDC_DMA_FB_CEILING_ADDR_0_REG, - (u32)tilcdc_crtc->palette_dma_handle - + TILCDC_REV1_PALETTE_SIZE - 1); + (u32) tilcdc_crtc->palette_dma_handle + + TILCDC_PALETTE_SIZE - 1);
- /* Load it. */ - tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, - LCDC_PALETTE_LOAD_MODE(DATA_ONLY)); - tilcdc_set(dev, LCDC_RASTER_CTRL_REG, - LCDC_PALETTE_LOAD_MODE(PALETTE_ONLY)); + /* Set dma load mode for palette loading only. */ + tilcdc_write_mask(dev, LCDC_RASTER_CTRL_REG, + LCDC_PALETTE_LOAD_MODE(PALETTE_ONLY), + LCDC_PALETTE_LOAD_MODE_MASK); + + /* Enable DMA Palette Loaded Interrupt */ + if (priv->rev == 1) + tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_PL_INT_ENA); + else + tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG, LCDC_V2_PL_INT_ENA);
- /* Enable the LCDC and wait for palette to be loaded. */ - tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_PL_INT_ENA); + /* Enable LCDC DMA and wait for palette to be loaded. */ + tilcdc_clear_irqstatus(dev, 0xffffffff); tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
wait_for_completion(&tilcdc_crtc->palette_loaded);
- /* Restore the registers. */ + /* Disable LCDC DMA and DMA Palette Loaded Interrupt. */ tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE); + if (priv->rev == 1) + tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_PL_INT_ENA); + else + tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG, LCDC_V2_PL_INT_ENA); + + /* Restore the registers. */ tilcdc_write(dev, LCDC_DMA_FB_BASE_ADDR_0_REG, dma_fb_base); tilcdc_write(dev, LCDC_DMA_FB_CEILING_ADDR_0_REG, dma_fb_ceiling); tilcdc_write(dev, LCDC_RASTER_CTRL_REG, raster_ctl); @@ -218,7 +223,6 @@ static void tilcdc_crtc_enable(struct drm_crtc *crtc) { struct drm_device *dev = crtc->dev; struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); - struct tilcdc_drm_private *priv = dev->dev_private;
WARN_ON(!drm_modeset_is_locked(&crtc->mutex)); mutex_lock(&tilcdc_crtc->enable_lock); @@ -231,7 +235,7 @@ static void tilcdc_crtc_enable(struct drm_crtc *crtc)
reset(crtc);
- if (priv->rev == 1 && !completion_done(&tilcdc_crtc->palette_loaded)) + if (!completion_done(&tilcdc_crtc->palette_loaded)) tilcdc_crtc_load_palette(crtc);
tilcdc_crtc_enable_irqs(dev); @@ -281,8 +285,7 @@ static void tilcdc_crtc_off(struct drm_crtc *crtc, bool shutdown) * LCDC will not retain the palette when reset. Make sure it gets * reloaded on tilcdc_crtc_enable(). */ - if (priv->rev == 1) - reinit_completion(&tilcdc_crtc->palette_loaded); + reinit_completion(&tilcdc_crtc->palette_loaded);
drm_crtc_vblank_off(crtc);
@@ -917,12 +920,14 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc) dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underflow", __func__, stat);
- if (priv->rev == 1) { - if (stat & LCDC_PL_LOAD_DONE) { - complete(&tilcdc_crtc->palette_loaded); - tilcdc_clear(dev, - LCDC_RASTER_CTRL_REG, LCDC_V1_PL_INT_ENA); - } + if (stat & LCDC_PL_LOAD_DONE) { + complete(&tilcdc_crtc->palette_loaded); + if (priv->rev == 1) + tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, + LCDC_V1_PL_INT_ENA); + else + tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG, + LCDC_V2_PL_INT_ENA); }
if (stat & LCDC_SYNC_LOST) { @@ -972,15 +977,14 @@ int tilcdc_crtc_create(struct drm_device *dev) return -ENOMEM; }
- if (priv->rev == 1) { - init_completion(&tilcdc_crtc->palette_loaded); - tilcdc_crtc->palette_base = dmam_alloc_coherent(dev->dev, - TILCDC_REV1_PALETTE_SIZE, + init_completion(&tilcdc_crtc->palette_loaded); + tilcdc_crtc->palette_base = dmam_alloc_coherent(dev->dev, + TILCDC_PALETTE_SIZE, &tilcdc_crtc->palette_dma_handle, GFP_KERNEL | __GFP_ZERO); - if (!tilcdc_crtc->palette_base) - return -ENOMEM; - } + if (!tilcdc_crtc->palette_base) + return -ENOMEM; + *tilcdc_crtc->palette_base = TILCDC_PALETTE_FIRST_ENTRY;
crtc = &tilcdc_crtc->base;