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Message-Id: <1477070049-9848-1-git-send-email-bgolaszewski@baylibre.com>
Date: Fri, 21 Oct 2016 19:14:09 +0200
From: Bartosz Golaszewski <bgolaszewski@...libre.com>
To: Jyri Sarha <jsarha@...com>, Tomi Valkeinen <tomi.valkeinen@...com>,
David Airlie <airlied@...ux.ie>,
Kevin Hilman <khilman@...libre.com>,
Michael Turquette <mturquette@...libre.com>,
Sekhar Nori <nsekhar@...com>
Cc: LKML <linux-kernel@...r.kernel.org>,
linux-drm <dri-devel@...ts.freedesktop.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Peter Ujfalusi <peter.ujfalusi@...com>,
Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH] drm: tilcdc: implement palette loading for rev1
Revision 1 of the IP doesn't work if we don't load the palette (even
if it's not used, which is the case for the RGB565 format).
Add a function called from tilcdc_crtc_enable() which performs all
required actions if we're dealing with a rev1 chip.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 82 +++++++++++++++++++++++++++++++++++-
1 file changed, 81 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 87cfde9..cc94cbb 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -21,11 +21,14 @@
#include <drm/drm_flip_work.h>
#include <drm/drm_plane_helper.h>
#include <linux/workqueue.h>
+#include <linux/completion.h>
#include "tilcdc_drv.h"
#include "tilcdc_regs.h"
-#define TILCDC_VBLANK_SAFETY_THRESHOLD_US 1000
+#define TILCDC_VBLANK_SAFETY_THRESHOLD_US 1000
+#define TILCDC_REV1_PALETTE_SIZE 32
+#define TILCDC_REV1_PALETTE_FIRST_ENTRY 0x4000
struct tilcdc_crtc {
struct drm_crtc base;
@@ -53,6 +56,10 @@ struct tilcdc_crtc {
int sync_lost_count;
bool frame_intact;
+
+ dma_addr_t palette_dma_handle;
+ void *palette_base;
+ struct completion palette_loaded;
};
#define to_tilcdc_crtc(x) container_of(x, struct tilcdc_crtc, base)
@@ -100,6 +107,55 @@ static void set_scanout(struct drm_crtc *crtc, struct drm_framebuffer *fb)
tilcdc_crtc->curr_fb = 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.
+ */
+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;
+
+ 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);
+ raster_ctl = tilcdc_read(dev, LCDC_RASTER_CTRL_REG);
+
+ /* Tell the LCDC where the palette is located. */
+ 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);
+
+ /* 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));
+
+ /* Enable the LCDC and wait for palette to be loaded. */
+ tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_PL_INT_ENA);
+ tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
+
+ wait_for_completion(&tilcdc_crtc->palette_loaded);
+
+ /* Restore the registers. */
+ tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
+ 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);
+}
+
static void tilcdc_crtc_enable_irqs(struct drm_device *dev)
{
struct tilcdc_drm_private *priv = dev->dev_private;
@@ -154,6 +210,7 @@ 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));
@@ -164,6 +221,9 @@ static void tilcdc_crtc_enable(struct drm_crtc *crtc)
reset(crtc);
+ if (priv->rev == 1 && !completion_done(&tilcdc_crtc->palette_loaded))
+ tilcdc_crtc_load_palette(crtc);
+
tilcdc_crtc_enable_irqs(dev);
tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_DUAL_FRAME_BUFFER_ENABLE);
@@ -245,6 +305,10 @@ static void tilcdc_crtc_destroy(struct drm_crtc *crtc)
of_node_put(crtc->port);
drm_crtc_cleanup(crtc);
drm_flip_work_cleanup(&tilcdc_crtc->unref_work);
+
+ dma_free_coherent(crtc->dev->dev, TILCDC_REV1_PALETTE_SIZE,
+ tilcdc_crtc->palette_base,
+ tilcdc_crtc->palette_dma_handle);
}
int tilcdc_crtc_update_fb(struct drm_crtc *crtc,
@@ -804,6 +868,14 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underfow",
__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);
+ }
+ }
+
/* For revision 2 only */
if (priv->rev == 2) {
if (stat & LCDC_FRAME_DONE) {
@@ -845,6 +917,14 @@ struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev)
return NULL;
}
+ init_completion(&tilcdc_crtc->palette_loaded);
+ tilcdc_crtc->palette_base = dma_zalloc_coherent(dev->dev,
+ TILCDC_REV1_PALETTE_SIZE,
+ &tilcdc_crtc->palette_dma_handle,
+ GFP_KERNEL);
+ if (!tilcdc_crtc->palette_base)
+ return ERR_PTR(-ENOMEM);
+
crtc = &tilcdc_crtc->base;
ret = tilcdc_plane_init(dev, &tilcdc_crtc->primary);
--
2.9.3
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