[PATCH 2/6] drm/msm/mdss: generate MDSS data for MDP5 platforms

[Dmitry Baryshkov]

Older (mdp5) platforms do not use per-SoC compatible strings. Instead
they use a single compat entry 'qcom,mdss'. To facilitate migrating
these platforms to the DPU driver provide a way to generate the MDSS /
UBWC data at runtime, when the DPU driver asks for it.

It is not possible to generate this data structure at the probe time,
since some platforms might not have MDP_CLK enabled, which makes reading
HW_REV register return 0.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
---
 drivers/gpu/drm/msm/msm_mdss.c | 37 ++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c
index 348c66b14683..fb6ee93b5abc 100644
--- a/drivers/gpu/drm/msm/msm_mdss.c
+++ b/drivers/gpu/drm/msm/msm_mdss.c
@@ -222,6 +222,36 @@ static void msm_mdss_setup_ubwc_dec_40(struct msm_mdss *msm_mdss)
 	}
 }
 
+static struct msm_mdss_data *msm_mdss_generate_mdp5_mdss_data(struct msm_mdss *mdss)
+{
+	struct msm_mdss_data *data;
+	u32 hw_rev;
+
+	data = devm_kzalloc(mdss->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return NULL;
+
+	hw_rev = readl_relaxed(mdss->mmio + HW_REV) >> 16;
+
+	if (hw_rev == 0x1007 || /* msm8996 */
+	    hw_rev == 0x100e || /* msm8937 */
+	    hw_rev == 0x1010 || /* msm8953 */
+	    hw_rev == 0x3000 || /* msm8998 */
+	    hw_rev == 0x3002 || /* sdm660 */
+	    hw_rev == 0x3003) { /* sdm630 */
+		data->ubwc_dec_version = UBWC_1_0;
+		data->ubwc_enc_version = UBWC_1_0;
+	}
+
+	if (hw_rev == 0x1007 || /* msm8996 */
+	    hw_rev == 0x3000) /* msm8998 */
+		data->highest_bank_bit = 2;
+	else
+		data->highest_bank_bit = 1;
+
+	return data;
+}
+
 const struct msm_mdss_data *msm_mdss_get_mdss_data(struct device *dev)
 {
 	struct msm_mdss *mdss;
@@ -231,6 +261,13 @@ const struct msm_mdss_data *msm_mdss_get_mdss_data(struct device *dev)
 
 	mdss = dev_get_drvdata(dev);
 
+	/*
+	 * We could not do it at the probe time, since hw revision register was
+	 * not readable. Fill data structure now for the MDP5 platforms.
+	 */
+	if (!mdss->mdss_data && mdss->is_mdp5)
+		mdss->mdss_data = msm_mdss_generate_mdp5_mdss_data(mdss);
+
 	return mdss->mdss_data;
 }
 
-- 
2.39.2