drm/malidp: Enable MMU prefetch on Mali-DP650

Mali-DP650 supports warming up the SMMU translations, by sending
requsts to the SMMU before a buffer is read.

There are two modes supported:

- PARTIAL: could be enabled when the buffer is composed of 4K or 64K
  pages, the display hardware will send a configurable number of
  requests before the actual reading.

- FULL: could be enabled when the buffer is composed of 1M or 2M
  pages, the display hardware will send requests before reading for
  all pages composing the buffer.

This patch adds a mechanism for detecting the page size and set the
MMU prefetch mode if possible.

Changes since v1:
 - For imported buffers use the already populated
   drm_gem_cma_object.sgt instead of calling
   driver.gem_prime_get_sg_table, which works just for buffers
   allocated through the gem_cma API.

Signed-off-by: Jamie Fox <jamie.fox@arm.com>
Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
[rebased and re-ordered functions]
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

1 files changed, 38 insertions, 9 deletions

diff --git a/drivers/gpu/drm/arm/malidp_hw.c b/drivers/gpu/drm/arm/malidp_hw.c
index 2781e462c1ed..c874ef4ac005 100644
--- a/drivers/gpu/drm/arm/malidp_hw.c
+++ b/drivers/gpu/drm/arm/malidp_hw.c
@@ -84,16 +84,45 @@ static const struct malidp_format_id malidp550_de_formats[] = {
 };
 
 static const struct malidp_layer malidp500_layers[] = {
-	{ DE_VIDEO1, MALIDP500_DE_LV_BASE, MALIDP500_DE_LV_PTR_BASE, MALIDP_DE_LV_STRIDE0, MALIDP500_LV_YUV2RGB },
-	{ DE_GRAPHICS1, MALIDP500_DE_LG1_BASE, MALIDP500_DE_LG1_PTR_BASE, MALIDP_DE_LG_STRIDE, 0 },
-	{ DE_GRAPHICS2, MALIDP500_DE_LG2_BASE, MALIDP500_DE_LG2_PTR_BASE, MALIDP_DE_LG_STRIDE, 0 },
+	/* id, base address, fb pointer address base, stride offset,
+	 *     yuv2rgb matrix offset, mmu control register offset
+	 */
+	{ DE_VIDEO1, MALIDP500_DE_LV_BASE, MALIDP500_DE_LV_PTR_BASE,
+		MALIDP_DE_LV_STRIDE0, MALIDP500_LV_YUV2RGB, 0 },
+	{ DE_GRAPHICS1, MALIDP500_DE_LG1_BASE, MALIDP500_DE_LG1_PTR_BASE,
+		MALIDP_DE_LG_STRIDE, 0, 0 },
+	{ DE_GRAPHICS2, MALIDP500_DE_LG2_BASE, MALIDP500_DE_LG2_PTR_BASE,
+		MALIDP_DE_LG_STRIDE, 0, 0 },
 };
 
 static const struct malidp_layer malidp550_layers[] = {
-	{ DE_VIDEO1, MALIDP550_DE_LV1_BASE, MALIDP550_DE_LV1_PTR_BASE, MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB },
-	{ DE_GRAPHICS1, MALIDP550_DE_LG_BASE, MALIDP550_DE_LG_PTR_BASE, MALIDP_DE_LG_STRIDE, 0 },
-	{ DE_VIDEO2, MALIDP550_DE_LV2_BASE, MALIDP550_DE_LV2_PTR_BASE, MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB },
-	{ DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE, MALIDP550_DE_LS_R1_STRIDE, 0 },
+	/* id, base address, fb pointer address base, stride offset,
+	 *     yuv2rgb matrix offset, mmu control register offset
+	 */
+	{ DE_VIDEO1, MALIDP550_DE_LV1_BASE, MALIDP550_DE_LV1_PTR_BASE,
+		MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, 0 },
+	{ DE_GRAPHICS1, MALIDP550_DE_LG_BASE, MALIDP550_DE_LG_PTR_BASE,
+		MALIDP_DE_LG_STRIDE, 0, 0 },
+	{ DE_VIDEO2, MALIDP550_DE_LV2_BASE, MALIDP550_DE_LV2_PTR_BASE,
+		MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, 0 },
+	{ DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE,
+		MALIDP550_DE_LS_R1_STRIDE, 0, 0 },
+};
+
+static const struct malidp_layer malidp650_layers[] = {
+	/* id, base address, fb pointer address base, stride offset,
+	 *     yuv2rgb matrix offset, mmu control register offset
+	 */
+	{ DE_VIDEO1, MALIDP550_DE_LV1_BASE, MALIDP550_DE_LV1_PTR_BASE,
+		MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB,
+		MALIDP650_DE_LV_MMU_CTRL },
+	{ DE_GRAPHICS1, MALIDP550_DE_LG_BASE, MALIDP550_DE_LG_PTR_BASE,
+		MALIDP_DE_LG_STRIDE, 0, MALIDP650_DE_LG_MMU_CTRL },
+	{ DE_VIDEO2, MALIDP550_DE_LV2_BASE, MALIDP550_DE_LV2_PTR_BASE,
+		MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB,
+		MALIDP650_DE_LV_MMU_CTRL },
+	{ DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE,
+		MALIDP550_DE_LS_R1_STRIDE, 0, MALIDP650_DE_LS_MMU_CTRL },
 };
 
 #define SE_N_SCALING_COEFFS	96
@@ -853,8 +882,8 @@ const struct malidp_hw malidp_device[MALIDP_MAX_DEVICES] = {
 			.dc_base = MALIDP550_DC_BASE,
 			.out_depth_base = MALIDP550_DE_OUTPUT_DEPTH,
 			.features = MALIDP_REGMAP_HAS_CLEARIRQ,
-			.n_layers = ARRAY_SIZE(malidp550_layers),
-			.layers = malidp550_layers,
+			.n_layers = ARRAY_SIZE(malidp650_layers),
+			.layers = malidp650_layers,
 			.de_irq_map = {
 				.irq_mask = MALIDP_DE_IRQ_UNDERRUN |
 					    MALIDP650_DE_IRQ_DRIFT |