msm:disp:dpu1: add UBWC support for display on SC7180

Commit Message

Kalyan Thota Jan. 23, 2020, 10:17 a.m. UTC

Add UBWC global configuration for display on
SC7180 target.

Signed-off-by: Kalyan Thota <[e-mail]>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 58 +++++++++++++++++++++++++++++++-
 1 file changed, 57 insertions(+), 1 deletion(-)

Comments

Doug Anderson Jan. 31, 2020, 10:38 p.m. UTC | #1

Hi,

On Thu, Jan 23, 2020 at 2:19 AM Kalyan Thota <[e-mail]> wrote:
>
> Add UBWC global configuration for display on
> SC7180 target.
>
> Signed-off-by: Kalyan Thota <[e-mail]>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 58 +++++++++++++++++++++++++++++++-
>  1 file changed, 57 insertions(+), 1 deletion(-)

I didn't do any sort of review of this patch, but I can say that
without it the screen on my sc7180-based device is super glitchy and
when I add this patch in the glitchies are gone.  Thus:

Tested-by: Douglas Anderson <[e-mail]>

...one note is that the subject of this patch seems a bit
non-standard.  I would have expected a tag more like "drm/msm/dpu:"
instead of "msm:disp:dpu1:".  Presumably if the maintainer cares when
landing he/she could fix that up, but something to think about for
future patches.

-Doug

Patch

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index 29705e7..80d3cfc 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -12,6 +12,7 @@ 
 
 #define to_dpu_mdss(x) container_of(x, struct dpu_mdss, base)
 
+#define HW_REV				0x0
 #define HW_INTR_STATUS			0x0010
 
 /* Max BW defined in KBps */
@@ -22,6 +23,17 @@  struct dpu_irq_controller {
 	struct irq_domain *domain;
 };
 
+struct dpu_hw_cfg {
+	u32 val;
+	u32 offset;
+};
+
+struct dpu_mdss_hw_init_handler {
+	u32 hw_rev;
+	u32 hw_reg_count;
+	struct dpu_hw_cfg* hw_cfg;
+};
+
 struct dpu_mdss {
 	struct msm_mdss base;
 	void __iomem *mmio;
@@ -32,6 +44,44 @@  struct dpu_mdss {
 	u32 num_paths;
 };
 
+static struct dpu_hw_cfg hw_cfg[] = {
+    {
+	/* UBWC global settings */
+	.val = 0x1E,
+	.offset = 0x144,
+    }
+};
+
+static struct dpu_mdss_hw_init_handler cfg_handler[] = {
+    { .hw_rev = DPU_HW_VER_620,
+      .hw_reg_count = ARRAY_SIZE(hw_cfg),
+      .hw_cfg = hw_cfg
+    },
+};
+
+static void dpu_mdss_hw_init(struct dpu_mdss *dpu_mdss, u32 hw_rev)
+{
+	int i;
+	u32 count = 0;
+	struct dpu_hw_cfg *hw_cfg = NULL;
+
+	for (i = 0; i < ARRAY_SIZE(cfg_handler); i++) {
+		if (cfg_handler[i].hw_rev == hw_rev) {
+			hw_cfg = cfg_handler[i].hw_cfg;
+			count = cfg_handler[i].hw_reg_count;
+			break;
+	    }
+	}
+
+	for (i = 0; i < count; i++ ) {
+		writel_relaxed(hw_cfg->val,
+			dpu_mdss->mmio + hw_cfg->offset);
+		hw_cfg++;
+	}
+
+    return;
+}
+
 static int dpu_mdss_parse_data_bus_icc_path(struct drm_device *dev,
 						struct dpu_mdss *dpu_mdss)
 {
@@ -174,12 +224,18 @@  static int dpu_mdss_enable(struct msm_mdss *mdss)
 	struct dpu_mdss *dpu_mdss = to_dpu_mdss(mdss);
 	struct dss_module_power *mp = &dpu_mdss->mp;
 	int ret;
+	u32 mdss_rev;
 
 	dpu_mdss_icc_request_bw(mdss);
 
 	ret = msm_dss_enable_clk(mp->clk_config, mp->num_clk, true);
-	if (ret)
+	if (ret) {
 		DPU_ERROR("clock enable failed, ret:%d\n", ret);
+		return ret;
+	}
+
+	mdss_rev = readl_relaxed(dpu_mdss->mmio + HW_REV);
+	dpu_mdss_hw_init(dpu_mdss, mdss_rev);
 
 	return ret;
 }