On 25/01/2024 21:38, Paloma Arellano wrote:
DP controller can be setup to operate in either SDP update flush mode or
peripheral flush mode based on the DP controller hardware version.
Starting in DP v1.2, the hardware documents require the use of
peripheral flush mode for SDP packets such as PPS OR VSC SDP packets.
In-line with this guidance, lets program the DP controller to use
peripheral flush mode starting DP v1.2
Signed-off-by: Paloma Arellano <quic_parellan@xxxxxxxxxxx>
---
drivers/gpu/drm/msm/dp/dp_catalog.c | 18 ++++++++++++++++++
drivers/gpu/drm/msm/dp/dp_catalog.h | 1 +
drivers/gpu/drm/msm/dp/dp_ctrl.c | 1 +
drivers/gpu/drm/msm/dp/dp_reg.h | 2 ++
4 files changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
index 7e4c68be23e56..b43083b9c2df6 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.c
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
@@ -446,6 +446,24 @@ void dp_catalog_ctrl_config_misc(struct dp_catalog *dp_catalog,
dp_write_link(catalog, REG_DP_MISC1_MISC0, misc_val);
}
+void dp_catalog_setup_peripheral_flush(struct dp_catalog *dp_catalog)
+{
+ u32 mainlink_ctrl;
+ u16 major = 0, minor = 0;
+ struct dp_catalog_private *catalog = container_of(dp_catalog,
+ struct dp_catalog_private, dp_catalog);
+
+ mainlink_ctrl = dp_read_link(catalog, REG_DP_MAINLINK_CTRL);
+
+ dp_catalog_hw_revision(dp_catalog, &major, &minor);
+ if (major >= 1 && minor >= 2)
if (major > 1 || (major == 1 && minor >= 2))
As a check, which of the values should be written for maj.min = 2.1?
+ mainlink_ctrl |= DP_MAINLINK_FLUSH_MODE_SDE_PERIPH_UPDATE;
+ else
+ mainlink_ctrl |= DP_MAINLINK_FLUSH_MODE_UPDATE_SDP;
+
+ dp_write_link(catalog, REG_DP_MAINLINK_CTRL, mainlink_ctrl);
+}
+
void dp_catalog_ctrl_config_msa(struct dp_catalog *dp_catalog,
u32 rate, u32 stream_rate_khz,
bool fixed_nvid, bool is_ycbcr_420)
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
index 6b757249c0698..1d57988aa6689 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.h
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
@@ -169,6 +169,7 @@ void dp_catalog_ctrl_config_ctrl(struct dp_catalog *dp_catalog, u32 config);
void dp_catalog_ctrl_lane_mapping(struct dp_catalog *dp_catalog);
void dp_catalog_ctrl_mainlink_ctrl(struct dp_catalog *dp_catalog, bool enable);
void dp_catalog_ctrl_psr_mainlink_enable(struct dp_catalog *dp_catalog, bool enable);
+void dp_catalog_setup_peripheral_flush(struct dp_catalog *dp_catalog);
void dp_catalog_ctrl_config_misc(struct dp_catalog *dp_catalog, u32 cc, u32 tb);
void dp_catalog_ctrl_config_msa(struct dp_catalog *dp_catalog, u32 rate,
u32 stream_rate_khz, bool fixed_nvid, bool is_ycbcr_420);
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index ddd92a63d5a67..c375b36f53ce1 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -170,6 +170,7 @@ static void dp_ctrl_configure_source_params(struct dp_ctrl_private *ctrl)
dp_catalog_ctrl_lane_mapping(ctrl->catalog);
dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, true);
+ dp_catalog_setup_peripheral_flush(ctrl->catalog);
dp_ctrl_config_ctrl(ctrl);
diff --git a/drivers/gpu/drm/msm/dp/dp_reg.h b/drivers/gpu/drm/msm/dp/dp_reg.h
index 756ddf85b1e81..05a1009d2f678 100644
--- a/drivers/gpu/drm/msm/dp/dp_reg.h
+++ b/drivers/gpu/drm/msm/dp/dp_reg.h
@@ -102,6 +102,8 @@
#define DP_MAINLINK_CTRL_ENABLE (0x00000001)
#define DP_MAINLINK_CTRL_RESET (0x00000002)
#define DP_MAINLINK_CTRL_SW_BYPASS_SCRAMBLER (0x00000010)
+#define DP_MAINLINK_FLUSH_MODE_UPDATE_SDP (0x00800000)
+#define DP_MAINLINK_FLUSH_MODE_SDE_PERIPH_UPDATE (0x01800000)
#define DP_MAINLINK_FB_BOUNDARY_SEL (0x02000000)
#define REG_DP_STATE_CTRL (0x00000004)
--
With best wishes
Dmitry
