[PATCH v4 15/16] drm/msm/dp: read hw revision only once

[Dmitry Baryshkov]

There is little point in rereading DP controller revision over and over
again. Read it once, after the first software reset and propagate it to
the dp_panel module.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
---
 drivers/gpu/drm/msm/dp/dp_catalog.c | 13 -------------
 drivers/gpu/drm/msm/dp/dp_catalog.h |  3 ---
 drivers/gpu/drm/msm/dp/dp_ctrl.c    | 12 +++++++++---
 drivers/gpu/drm/msm/dp/dp_panel.c   |  3 +--
 drivers/gpu/drm/msm/dp/dp_panel.h   |  1 +
 5 files changed, 11 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
index 2992a0df262e9ab167a21a270d1aa8fd1383033d..84adf3a38e4cf0619b15850c31416f1e67049a42 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.c
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
@@ -42,19 +42,6 @@ void msm_dp_catalog_snapshot(struct msm_dp_catalog *msm_dp_catalog, struct msm_d
 				    msm_dp_catalog->p0_len, msm_dp_catalog->p0_base, "dp_p0");
 }
 
-/**
- * msm_dp_catalog_hw_revision() - retrieve DP hw revision
- *
- * @msm_dp_catalog: DP catalog structure
- *
- * Return: DP controller hw revision
- *
- */
-u32 msm_dp_catalog_hw_revision(const struct msm_dp_catalog *msm_dp_catalog)
-{
-	return msm_dp_read_ahb(msm_dp_catalog, REG_DP_HW_VERSION);
-}
-
 static void __iomem *msm_dp_ioremap(struct platform_device *pdev, int idx, size_t *len)
 {
 	struct resource *res;
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
index 310319619242df5fa0d91c89fbcc477f16c130ea..ddbae0fcf5fc428b2d37cd1eab1d5860a2f11a50 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.h
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
@@ -95,9 +95,6 @@ static inline void msm_dp_write_link(struct msm_dp_catalog *msm_dp_catalog,
 /* Debug module */
 void msm_dp_catalog_snapshot(struct msm_dp_catalog *msm_dp_catalog, struct msm_disp_state *disp_state);
 
-/* DP Controller APIs */
-u32 msm_dp_catalog_hw_revision(const struct msm_dp_catalog *msm_dp_catalog);
-
 struct msm_dp_catalog *msm_dp_catalog_get(struct device *dev);
 
 #endif /* _DP_CATALOG_H_ */
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index b15b7ba599e29c4edd746e9c2a8bf2f4a8eedf15..60dbf7eab3fd184bc12035d267abb3758cce9f89 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -131,6 +131,8 @@ struct msm_dp_ctrl_private {
 	struct completion psr_op_comp;
 	struct completion video_comp;
 
+	u32 hw_revision;
+
 	bool core_clks_on;
 	bool link_clks_on;
 	bool stream_clks_on;
@@ -173,6 +175,11 @@ void msm_dp_ctrl_reset(struct msm_dp_ctrl *msm_dp_ctrl)
 
 	sw_reset &= ~DP_SW_RESET;
 	msm_dp_write_ahb(msm_dp_catalog, REG_DP_SW_RESET, sw_reset);
+
+	if (!ctrl->hw_revision) {
+		ctrl->hw_revision = msm_dp_read_ahb(msm_dp_catalog, REG_DP_HW_VERSION);
+		ctrl->panel->hw_revision = ctrl->hw_revision;
+	}
 }
 
 static u32 msm_dp_ctrl_get_aux_interrupt(struct msm_dp_ctrl_private *ctrl)
@@ -307,12 +314,11 @@ static void msm_dp_ctrl_mainlink_disable(struct msm_dp_ctrl_private *ctrl)
 static void msm_dp_setup_peripheral_flush(struct msm_dp_ctrl_private *ctrl)
 {
 	struct msm_dp_catalog *msm_dp_catalog = ctrl->catalog;
-	u32 mainlink_ctrl, hw_revision;
+	u32 mainlink_ctrl;
 
 	mainlink_ctrl = msm_dp_read_link(msm_dp_catalog, REG_DP_MAINLINK_CTRL);
 
-	hw_revision = msm_dp_catalog_hw_revision(msm_dp_catalog);
-	if (hw_revision >= DP_HW_VERSION_1_2)
+	if (ctrl->hw_revision >= DP_HW_VERSION_1_2)
 		mainlink_ctrl |= DP_MAINLINK_FLUSH_MODE_SDE_PERIPH_UPDATE;
 	else
 		mainlink_ctrl |= DP_MAINLINK_FLUSH_MODE_UPDATE_SDP;
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
index 3441c28e3ce332bfe932d7adee7f0ecbaa486c2e..969d618c909876fd7a13aeb6e6c9e117071bc682 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.c
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -380,9 +380,8 @@ static void msm_dp_panel_send_vsc_sdp(struct msm_dp_panel_private *panel, struct
 
 static void msm_dp_panel_update_sdp(struct msm_dp_panel_private *panel)
 {
-	u32 hw_revision;
+	u32 hw_revision = panel->msm_dp_panel.hw_revision;
 
-	hw_revision = msm_dp_catalog_hw_revision(panel->catalog);
 	if (hw_revision >= DP_HW_VERSION_1_0 &&
 	    hw_revision < DP_HW_VERSION_1_2) {
 		msm_dp_write_link(panel->catalog, MMSS_DP_SDP_CFG3, UPDATE_SDP);
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.h b/drivers/gpu/drm/msm/dp/dp_panel.h
index 8dde55b3a5ab64c0c12d69cb2dd5b5c733c83432..c348417bb07f33efdf1402a73c27ff99e394e5a3 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.h
+++ b/drivers/gpu/drm/msm/dp/dp_panel.h
@@ -38,6 +38,7 @@ struct msm_dp_panel {
 	struct msm_dp_panel_psr psr_cap;
 	bool video_test;
 	bool vsc_sdp_supported;
+	u32 hw_revision;
 
 	u32 max_dp_lanes;
 	u32 max_dp_link_rate;

-- 
2.39.5