[PATCH 1/5] drm/msm: less magic numbers in msm_mdss_enable

[Dmitry Baryshkov <dmitry.baryshkov@linaro.org>]

Replace magic register writes in msm_mdss_enable() with version that
contains less magic and more variable names that can be traced back to
the dpu_hw_catalog or the downstream dtsi files.

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/msm_mdss.c | 80 ++++++++++++++++++++++++++++++----
 1 file changed, 72 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c
index 0454a571adf7..b41848bfff91 100644
--- a/drivers/gpu/drm/msm/msm_mdss.c
+++ b/drivers/gpu/drm/msm/msm_mdss.c
@@ -21,6 +21,7 @@
 #define HW_REV				0x0
 #define HW_INTR_STATUS			0x0010
 
+#define UBWC_DEC_HW_VERSION		0x58
 #define UBWC_STATIC			0x144
 #define UBWC_CTRL_2			0x150
 #define UBWC_PREDICTION_MODE		0x154
@@ -132,9 +133,63 @@ static int _msm_mdss_irq_domain_add(struct msm_mdss *msm_mdss)
 	return 0;
 }
 
+#define UBWC_1_0 0x10000000
+#define UBWC_2_0 0x20000000
+#define UBWC_3_0 0x30000000
+#define UBWC_4_0 0x40000000
+
+static void msm_mdss_setup_ubwc_dec_20(struct msm_mdss *msm_mdss,
+				       u32 ubwc_static)
+{
+	writel_relaxed(ubwc_static, msm_mdss->mmio + UBWC_STATIC);
+}
+
+static void msm_mdss_setup_ubwc_dec_30(struct msm_mdss *msm_mdss,
+				       unsigned int ubwc_version,
+				       u32 ubwc_swizzle,
+				       u32 highest_bank_bit,
+				       u32 macrotile_mode)
+{
+	u32 value = (ubwc_swizzle & 0x1) |
+		    (highest_bank_bit & 0x3) << 4 |
+		    (macrotile_mode & 0x1) << 12;
+
+	if (ubwc_version == UBWC_3_0)
+		value |= BIT(10);
+
+	if (ubwc_version == UBWC_1_0)
+		value |= BIT(8);
+
+	writel_relaxed(value, msm_mdss->mmio + UBWC_STATIC);
+}
+
+static void msm_mdss_setup_ubwc_dec_40(struct msm_mdss *msm_mdss,
+				       unsigned int ubwc_version,
+				       u32 ubwc_swizzle,
+				       u32 ubwc_static,
+				       u32 highest_bank_bit,
+				       u32 macrotile_mode)
+{
+	u32 value = (ubwc_swizzle & 0x7) |
+		    (ubwc_static & 0x1) << 3 |
+		    (highest_bank_bit & 0x7) << 4 |
+		    (macrotile_mode & 0x1) << 12;
+
+	writel_relaxed(value, msm_mdss->mmio + UBWC_STATIC);
+
+	if (ubwc_version == UBWC_3_0) {
+		writel_relaxed(1, msm_mdss->mmio + UBWC_CTRL_2);
+		writel_relaxed(0, msm_mdss->mmio + UBWC_PREDICTION_MODE);
+	} else {
+		writel_relaxed(2, msm_mdss->mmio + UBWC_CTRL_2);
+		writel_relaxed(1, msm_mdss->mmio + UBWC_PREDICTION_MODE);
+	}
+}
+
 static int msm_mdss_enable(struct msm_mdss *msm_mdss)
 {
 	int ret;
+	u32 hw_rev;
 
 	ret = clk_bulk_prepare_enable(msm_mdss->num_clocks, msm_mdss->clocks);
 	if (ret) {
@@ -149,26 +204,35 @@ static int msm_mdss_enable(struct msm_mdss *msm_mdss)
 	if (msm_mdss->is_mdp5)
 		return 0;
 
+	hw_rev = readl_relaxed(msm_mdss->mmio + HW_REV);
+	dev_dbg(msm_mdss->dev, "HW_REV: 0x%x\n", hw_rev);
+	dev_dbg(msm_mdss->dev, "UBWC_DEC_HW_VERSION: 0x%x\n",
+		readl_relaxed(msm_mdss->mmio + UBWC_DEC_HW_VERSION));
+
 	/*
 	 * ubwc config is part of the "mdss" region which is not accessible
 	 * from the rest of the driver. hardcode known configurations here
+	 *
+	 * Decoder version can be read from the UBWC_DEC_HW_VERSION reg,
+	 * UBWC_n and the rest of params comes from hw_catalog.
+	 * Unforunately this driver can not access hw catalog, so we have to
+	 * hardcode them here.
 	 */
-	switch (readl_relaxed(msm_mdss->mmio + HW_REV)) {
+	switch (hw_rev) {
 	case DPU_HW_VER_500:
 	case DPU_HW_VER_501:
-		writel_relaxed(0x420, msm_mdss->mmio + UBWC_STATIC);
+		msm_mdss_setup_ubwc_dec_30(msm_mdss, UBWC_3_0, 0, 2, 0);
 		break;
 	case DPU_HW_VER_600:
-		/* TODO: 0x102e for LP_DDR4 */
-		writel_relaxed(0x103e, msm_mdss->mmio + UBWC_STATIC);
-		writel_relaxed(2, msm_mdss->mmio + UBWC_CTRL_2);
-		writel_relaxed(1, msm_mdss->mmio + UBWC_PREDICTION_MODE);
+		/* TODO: highest_bank_bit = 2 for LP_DDR4 */
+		msm_mdss_setup_ubwc_dec_40(msm_mdss, UBWC_4_0, 6, 1, 3, 1);
 		break;
 	case DPU_HW_VER_620:
-		writel_relaxed(0x1e, msm_mdss->mmio + UBWC_STATIC);
+		/* UBWC_2_0 */
+		msm_mdss_setup_ubwc_dec_20(msm_mdss, 0x1e);
 		break;
 	case DPU_HW_VER_720:
-		writel_relaxed(0x101e, msm_mdss->mmio + UBWC_STATIC);
+		msm_mdss_setup_ubwc_dec_40(msm_mdss, UBWC_3_0, 6, 1, 1, 1);
 		break;
 	}
 
-- 
2.35.1