[PATCH 4/6] drm: mali-dp: Add support for writeback on DP550/DP650

Brian Starkey
2016-11-25T16:49:55Z

From: Liviu Dudau <Liviu.Dudau@arm.com>

Mali-DP display processors are able to write the composition result to a
memory buffer via the SE.

Add entry points in the HAL for enabling/disabling this feature, and
implement support for it on DP650 and DP550. DP500 acts differently and
so is omitted from this change.

Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Brian Starkey <brian.starkey@arm.com>
---
drivers/gpu/drm/arm/malidp_hw.c | 52 +++++++++++++++++++++++++++++++++++--
drivers/gpu/drm/arm/malidp_hw.h | 18 +++++++++++++
drivers/gpu/drm/arm/malidp_regs.h | 15 +++++++++++
3 files changed, 83 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/arm/malidp_hw.c b/drivers/gpu/drm/arm/malidp_hw.c
index 9ec6d69..c696e67 100644
--- a/drivers/gpu/drm/arm/malidp_hw.c
+++ b/drivers/gpu/drm/arm/malidp_hw.c
@@ -384,6 +384,48 @@ static int malidp550_rotmem_required(struct malidp_hw_device *hwdev, u16 w, u16
return w * bytes_per_col;
}

+static int malidp550_enable_memwrite(struct malidp_hw_device *hwdev,
+ dma_addr_t *addrs, s32 *pitches,
+ int num_planes, u16 w, u16 h, u32 fmt_id)
+{
+ u32 base = MALIDP550_SE_MEMWRITE_BASE;
+ u32 de_base = malidp_get_block_base(hwdev, MALIDP_DE_BLOCK);
+
+ /* enable the scaling engine block */
+ malidp_hw_setbits(hwdev, MALIDP_SCALE_ENGINE_EN, de_base + MALIDP_DE_DISPLAY_FUNC);
+
+ malidp_hw_write(hwdev, fmt_id, base + MALIDP_MW_FORMAT);
+ switch (num_planes) {
+ case 2:
+ malidp_hw_write(hwdev, lower_32_bits(addrs[1]), base + MALIDP_MW_P2_PTR_LOW);
+ malidp_hw_write(hwdev, upper_32_bits(addrs[1]), base + MALIDP_MW_P2_PTR_HIGH);
+ malidp_hw_write(hwdev, pitches[1], base + MALIDP_MW_P2_STRIDE);
+ /* fall through */
+ case 1:
+ malidp_hw_write(hwdev, lower_32_bits(addrs[0]), base + MALIDP_MW_P1_PTR_LOW);
+ malidp_hw_write(hwdev, upper_32_bits(addrs[0]), base + MALIDP_MW_P1_PTR_HIGH);
+ malidp_hw_write(hwdev, pitches[0], base + MALIDP_MW_P1_STRIDE);
+ break;
+ default:
+ WARN(1, "Invalid number of planes");
+ }
+
+ malidp_hw_write(hwdev, MALIDP_DE_H_ACTIVE(w) | MALIDP_DE_V_ACTIVE(h),
+ MALIDP550_SE_MEMWRITE_OUT_SIZE);
+ malidp_hw_setbits(hwdev, MALIDP550_SE_MEMWRITE_ONESHOT | MALIDP_SE_MEMWRITE_EN,
+ MALIDP550_SE_CONTROL);
+
+ return 0;
+}
+
+static void malidp550_disable_memwrite(struct malidp_hw_device *hwdev)
+{
+ u32 base = malidp_get_block_base(hwdev, MALIDP_DE_BLOCK);
+ malidp_hw_clearbits(hwdev, MALIDP550_SE_MEMWRITE_ONESHOT | MALIDP_SE_MEMWRITE_EN,
+ MALIDP550_SE_CONTROL);
+ malidp_hw_clearbits(hwdev, MALIDP_SCALE_ENGINE_EN, base + MALIDP_DE_DISPLAY_FUNC);
+}
+
static int malidp650_query_hw(struct malidp_hw_device *hwdev)
{
u32 conf = malidp_hw_read(hwdev, MALIDP550_CONFIG_ID);
@@ -466,7 +508,8 @@ static int malidp650_query_hw(struct malidp_hw_device *hwdev)
MALIDP550_SE_IRQ_AXI_ERR,
},
.dc_irq_map = {
- .irq_mask = MALIDP550_DC_IRQ_CONF_VALID,
+ .irq_mask = MALIDP550_DC_IRQ_CONF_VALID |
+ MALIDP550_DC_IRQ_SE,
.vsync_irq = MALIDP550_DC_IRQ_CONF_VALID,
},
.pixel_formats = malidp550_de_formats,
@@ -480,6 +523,8 @@ static int malidp650_query_hw(struct malidp_hw_device *hwdev)
.set_config_valid = malidp550_set_config_valid,
.modeset = malidp550_modeset,
.rotmem_required = malidp550_rotmem_required,
+ .enable_memwrite = malidp550_enable_memwrite,
+ .disable_memwrite = malidp550_disable_memwrite,
},
[MALIDP_650] = {
.map = {
@@ -500,7 +545,8 @@ static int malidp650_query_hw(struct malidp_hw_device *hwdev)
MALIDP550_SE_IRQ_AXI_ERR,
},
.dc_irq_map = {
- .irq_mask = MALIDP550_DC_IRQ_CONF_VALID,
+ .irq_mask = MALIDP550_DC_IRQ_CONF_VALID |
+ MALIDP550_DC_IRQ_SE,
.vsync_irq = MALIDP550_DC_IRQ_CONF_VALID,
},
.pixel_formats = malidp550_de_formats,
@@ -514,6 +560,8 @@ static int malidp650_query_hw(struct malidp_hw_device *hwdev)
.set_config_valid = malidp550_set_config_valid,
.modeset = malidp550_modeset,
.rotmem_required = malidp550_rotmem_required,
+ .enable_memwrite = malidp550_enable_memwrite,
+ .disable_memwrite = malidp550_disable_memwrite,
},
};

diff --git a/drivers/gpu/drm/arm/malidp_hw.h b/drivers/gpu/drm/arm/malidp_hw.h
index 4f8c884..091171d 100644
--- a/drivers/gpu/drm/arm/malidp_hw.h
+++ b/drivers/gpu/drm/arm/malidp_hw.h
@@ -146,6 +146,24 @@ struct malidp_hw_device {
*/
int (*rotmem_required)(struct malidp_hw_device *hwdev, u16 w, u16 h, u32 fmt);

+ /**
+ * Enable writing to memory the content of the next frame
+ * @param hwdev - malidp_hw_device structure containing the HW description
+ * @param addrs - array of addresses for each plane
+ * @param pitches - array of pitches for each plane
+ * @param num_planes - number of planes to be written
+ * @param w - width of the output frame
+ * @param h - height of the output frame
+ * @param fmt_id - internal format ID of output buffer
+ */
+ int (*enable_memwrite)(struct malidp_hw_device *hwdev, dma_addr_t *addrs,
+ s32 *pitches, int num_planes, u16 w, u16 h, u32 fmt_id);
+
+ /*
+ * Disable the writing to memory of the next frame's content.
+ */
+ void (*disable_memwrite)(struct malidp_hw_device *hwdev);
+
u8 features;

u8 min_line_size;
diff --git a/drivers/gpu/drm/arm/malidp_regs.h b/drivers/gpu/drm/arm/malidp_regs.h
index 73fecb3..cab086c 100644
--- a/drivers/gpu/drm/arm/malidp_regs.h
+++ b/drivers/gpu/drm/arm/malidp_regs.h
@@ -64,6 +64,8 @@
/* bit masks that are common between products */
#define MALIDP_CFG_VALID (1 << 0)
#define MALIDP_DISP_FUNC_ILACED (1 << 8)
+#define MALIDP_SCALE_ENGINE_EN (1 << 16)
+#define MALIDP_SE_MEMWRITE_EN (2 << 5)

/* register offsets for IRQ management */
#define MALIDP_REG_STATUS 0x00000
@@ -92,6 +94,15 @@
#define MALIDP_DE_H_ACTIVE(x) (((x) & 0x1fff) << 0)
#define MALIDP_DE_V_ACTIVE(x) (((x) & 0x1fff) << 16)

+/* register offsets relative to MALIDP5x0_SE_MEMWRITE_BASE */
+#define MALIDP_MW_FORMAT 0x00000
+#define MALIDP_MW_P1_STRIDE 0x00004
+#define MALIDP_MW_P2_STRIDE 0x00008
+#define MALIDP_MW_P1_PTR_LOW 0x0000c
+#define MALIDP_MW_P1_PTR_HIGH 0x00010
+#define MALIDP_MW_P2_PTR_LOW 0x0002c
+#define MALIDP_MW_P2_PTR_HIGH 0x00030
+
/* register offsets and bits specific to DP500 */
#define MALIDP500_DC_BASE 0x00000
#define MALIDP500_DC_CONTROL 0x0000c
@@ -149,6 +160,10 @@
#define MALIDP550_DE_LS_PTR_BASE 0x0042c
#define MALIDP550_DE_PERF_BASE 0x00500
#define MALIDP550_SE_BASE 0x08000
+#define MALIDP550_SE_CONTROL 0x08010
+#define MALIDP550_SE_MEMWRITE_ONESHOT (1 << 7)
+#define MALIDP550_SE_MEMWRITE_OUT_SIZE 0x08030
+#define MALIDP550_SE_MEMWRITE_BASE 0x08100
#define MALIDP550_DC_BASE 0x0c000
#define MALIDP550_DC_CONTROL 0x0c010
#define MALIDP550_DC_CONFIG_REQ (1 << 16)
--
1.7.9.5