[PATCH 1/4] gpu: ipu-v3: pre: add tiled prefetch support

[Lucas Stach]

This configures the TPR unit, using the DRM format modifier. For now only
the single buffer modifiers are supported, as split buffer needs more
configuration for the required cropping.

Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
---
 drivers/gpu/ipu-v3/ipu-pre.c | 24 ++++++++++++++++++++++--
 drivers/gpu/ipu-v3/ipu-prg.c |  2 +-
 drivers/gpu/ipu-v3/ipu-prv.h |  4 ++--
 3 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-pre.c b/drivers/gpu/ipu-v3/ipu-pre.c
index c55563379e2e..d895f92d8d33 100644
--- a/drivers/gpu/ipu-v3/ipu-pre.c
+++ b/drivers/gpu/ipu-v3/ipu-pre.c
@@ -49,6 +49,10 @@
 #define IPU_PRE_TPR_CTRL				0x070
 #define  IPU_PRE_TPR_CTRL_TILE_FORMAT(v)		((v & 0xff) << 0)
 #define  IPU_PRE_TPR_CTRL_TILE_FORMAT_MASK		0xff
+#define  IPU_PRE_TPR_CTRL_TILE_FORMAT_16_BIT		(1 << 0)
+#define  IPU_PRE_TPR_CTRL_TILE_FORMAT_SPLIT_BUF		(1 << 4)
+#define  IPU_PRE_TPR_CTRL_TILE_FORMAT_SINGLE_BUF	(1 << 5)
+#define  IPU_PRE_TPR_CTRL_TILE_FORMAT_SUPER_TILED	(1 << 6)
 
 #define IPU_PRE_PREFETCH_ENG_CTRL			0x080
 #define  IPU_PRE_PREF_ENG_CTRL_PREFETCH_EN		(1 << 0)
@@ -140,7 +144,7 @@ int ipu_pre_get(struct ipu_pre *pre)
 	val = IPU_PRE_CTRL_HANDSHAKE_ABORT_SKIP_EN |
 	      IPU_PRE_CTRL_HANDSHAKE_EN |
 	      IPU_PRE_CTRL_TPR_REST_SEL |
-	      IPU_PRE_CTRL_BLOCK_16 | IPU_PRE_CTRL_SDW_UPDATE;
+	      IPU_PRE_CTRL_SDW_UPDATE;
 	writel(val, pre->regs + IPU_PRE_CTRL);
 
 	pre->in_use = true;
@@ -161,7 +165,7 @@ void ipu_pre_put(struct ipu_pre *pre)
 
 void ipu_pre_configure(struct ipu_pre *pre, unsigned int width,
 		       unsigned int height, unsigned int stride, u32 format,
-		       unsigned int bufaddr)
+		       uint64_t modifier, unsigned int bufaddr)
 {
 	const struct drm_format_info *info = drm_format_info(format);
 	u32 active_bpp = info->cpp[0] >> 1;
@@ -198,9 +202,25 @@ void ipu_pre_configure(struct ipu_pre *pre, unsigned int width,
 
 	writel(pre->buffer_paddr, pre->regs + IPU_PRE_STORE_ENG_ADDR);
 
+	val = readl(pre->regs + IPU_PRE_TPR_CTRL);
+	val &= ~IPU_PRE_TPR_CTRL_TILE_FORMAT_MASK;
+	if (modifier != DRM_FORMAT_MOD_LINEAR) {
+		/* only support single buffer formats for now */
+		val |= IPU_PRE_TPR_CTRL_TILE_FORMAT_SINGLE_BUF;
+		if (modifier == DRM_FORMAT_MOD_VIVANTE_SUPER_TILED)
+			val |= IPU_PRE_TPR_CTRL_TILE_FORMAT_SUPER_TILED;
+		if (info->cpp[0] == 2)
+			val |= IPU_PRE_TPR_CTRL_TILE_FORMAT_16_BIT;
+	}
+	writel(val, pre->regs + IPU_PRE_TPR_CTRL);
+
 	val = readl(pre->regs + IPU_PRE_CTRL);
 	val |= IPU_PRE_CTRL_EN_REPEAT | IPU_PRE_CTRL_ENABLE |
 	       IPU_PRE_CTRL_SDW_UPDATE;
+	if (modifier == DRM_FORMAT_MOD_LINEAR)
+		val &= ~IPU_PRE_CTRL_BLOCK_EN;
+	else
+		val |= IPU_PRE_CTRL_BLOCK_EN;
 	writel(val, pre->regs + IPU_PRE_CTRL);
 }
 
diff --git a/drivers/gpu/ipu-v3/ipu-prg.c b/drivers/gpu/ipu-v3/ipu-prg.c
index ecc9ea44dc50..454b1f1eb5df 100644
--- a/drivers/gpu/ipu-v3/ipu-prg.c
+++ b/drivers/gpu/ipu-v3/ipu-prg.c
@@ -295,7 +295,7 @@ int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan,
 		return ret;
 
 	ipu_pre_configure(prg->pres[chan->used_pre],
-			  width, height, stride, format, *eba);
+			  width, height, stride, format, 0, *eba);
 
 
 	ret = clk_prepare_enable(prg->clk_ipg);
diff --git a/drivers/gpu/ipu-v3/ipu-prv.h b/drivers/gpu/ipu-v3/ipu-prv.h
index ca2a223a0d1e..11be49de2eba 100644
--- a/drivers/gpu/ipu-v3/ipu-prv.h
+++ b/drivers/gpu/ipu-v3/ipu-prv.h
@@ -274,8 +274,8 @@ int ipu_pre_get(struct ipu_pre *pre);
 void ipu_pre_put(struct ipu_pre *pre);
 u32 ipu_pre_get_baddr(struct ipu_pre *pre);
 void ipu_pre_configure(struct ipu_pre *pre, unsigned int width,
-		       unsigned int height,
-		       unsigned int stride, u32 format, unsigned int bufaddr);
+		       unsigned int height, unsigned int stride, u32 format,
+		       uint64_t modifier, unsigned int bufaddr);
 void ipu_pre_update(struct ipu_pre *pre, unsigned int bufaddr);
 
 struct ipu_prg *ipu_prg_lookup_by_phandle(struct device *dev, const char *name,
-- 
2.11.0