2016-11-22 17:54 GMT+01:00 Jyri Sarha <jsarha@xxxxxx>:
> 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@xxxxxx>
> ---
> drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 85 +++++++++++++++++-------------------
> 1 file changed, 41 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
> index 0f89422..3bdab77 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);
> @@ -217,7 +222,6 @@ 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);
> @@ -230,7 +234,7 @@ 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);
> @@ -280,8 +284,7 @@ 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);
>
> @@ -916,13 +919,8 @@ 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);
>
The LCDC_V1_PL_INT_ENA bit needs to be cleared here. Otherwise the
system freezes - surprisingly later at register_framebuffer() - in
revision 1.
Thanks,
Bartosz Golaszewski
> if (stat & LCDC_SYNC_LOST) {
> dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost",
> @@ -968,15 +966,14 @@ 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;
>
> --
> 1.9.1
>
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