drm/msm/dsi: Allow to specify dsi config as pdata

Config autodetect based on DSI controller version is quite limited
since several qcom SoCs can integrate a DSI controller with the same
version, but with different config (io_offset, supplies, etc).

This change allows to specify dsi config via device data pointer.
config autodetect is still used in case data pointer is NULL.
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/474089/
Link: https://lore.kernel.org/r/1644853060-12222-1-git-send-email-loic.poulain@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/dsi/dsi.c

@@ -175,7 +175,7 @@ static int dsi_dev_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id dt_match[] = {
-	{ .compatible = "qcom,mdss-dsi-ctrl" },
+	{ .compatible = "qcom,mdss-dsi-ctrl", .data = NULL /* autodetect cfg */ },
 	{}
 };
 

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -212,6 +212,10 @@ static const struct msm_dsi_cfg_handler *dsi_get_config(
 	int ret;
 	u32 major = 0, minor = 0;
 
+	cfg_hnd = device_get_match_data(dev);
+	if (cfg_hnd)
+		return cfg_hnd;
+
 	ahb_clk = msm_clk_get(msm_host->pdev, "iface");
 	if (IS_ERR(ahb_clk)) {
 		pr_err("%s: cannot get interface clock\n", __func__);