drm: rcar-du: lvds: Add R8A77970 support

Add support for the R-Car V3M (R8A77970) SoC to the LVDS encoder driver.
Note that there are some differences with the other R-Car gen3 SoCs, e.g.
LVDPLLCR has the same layout as in the R-Car gen2 SoCs.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

1 files changed, 18 insertions, 2 deletions

diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index 1247e26a0559..3d2d3bbd1342 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -32,6 +32,9 @@ enum rcar_lvds_mode {
 };
 
 #define RCAR_LVDS_QUIRK_LANES   (1 << 0)        /* LVDS lanes 1 and 3 inverted */
+#define RCAR_LVDS_QUIRK_GEN2_PLLCR (1 << 1)     /* LVDPLLCR has gen2 layout */
+#define RCAR_LVDS_QUIRK_GEN3_LVEN (1 << 2)      /* LVEN bit needs to be set */
+                                                /* on R8A77970/R8A7799x */
 
 struct rcar_lvds_device_info {
         unsigned int gen;
@@ -191,7 +194,7 @@ static void rcar_lvds_enable(struct drm_bridge *bridge)
         rcar_lvds_write(lvds, LVDCHCR, lvdhcr);
 
         /* PLL clock configuration. */
-        if (lvds->info->gen < 3)
+        if (lvds->info->quirks & RCAR_LVDS_QUIRK_GEN2_PLLCR)
                 lvdpllcr = rcar_lvds_lvdpllcr_gen2(mode->clock);
         else
                 lvdpllcr = rcar_lvds_lvdpllcr_gen3(mode->clock);
@@ -224,6 +227,12 @@ static void rcar_lvds_enable(struct drm_bridge *bridge)
                 rcar_lvds_write(lvds, LVDCR0, lvdcr0);
         }
 
+        if (lvds->info->quirks & RCAR_LVDS_QUIRK_GEN3_LVEN) {
+                /* Turn on the LVDS PHY. */
+                lvdcr0 |= LVDCR0_LVEN;
+                rcar_lvds_write(lvds, LVDCR0, lvdcr0);
+        }
+
         /* Wait for the startup delay. */
         usleep_range(100, 150);
 
@@ -485,17 +494,23 @@ static int rcar_lvds_remove(struct platform_device *pdev)
 
 static const struct rcar_lvds_device_info rcar_lvds_gen2_info = {
         .gen = 2,
+        .quirks = RCAR_LVDS_QUIRK_GEN2_PLLCR,
 };
 
 static const struct rcar_lvds_device_info rcar_lvds_r8a7790_info = {
         .gen = 2,
-        .quirks = RCAR_LVDS_QUIRK_LANES,
+        .quirks = RCAR_LVDS_QUIRK_GEN2_PLLCR | RCAR_LVDS_QUIRK_LANES,
 };
 
 static const struct rcar_lvds_device_info rcar_lvds_gen3_info = {
         .gen = 3,
 };
 
+static const struct rcar_lvds_device_info rcar_lvds_r8a77970_info = {
+        .gen = 3,
+        .quirks = RCAR_LVDS_QUIRK_GEN2_PLLCR | RCAR_LVDS_QUIRK_GEN3_LVEN,
+};
+
 static const struct of_device_id rcar_lvds_of_table[] = {
         { .compatible = "renesas,r8a7743-lvds", .data = &rcar_lvds_gen2_info },
         { .compatible = "renesas,r8a7790-lvds", .data = &rcar_lvds_r8a7790_info },
@@ -503,6 +518,7 @@ static const struct of_device_id rcar_lvds_of_table[] = {
         { .compatible = "renesas,r8a7793-lvds", .data = &rcar_lvds_gen2_info },
         { .compatible = "renesas,r8a7795-lvds", .data = &rcar_lvds_gen3_info },
         { .compatible = "renesas,r8a7796-lvds", .data = &rcar_lvds_gen3_info },
+        { .compatible = "renesas,r8a77970-lvds", .data = &rcar_lvds_r8a77970_info },
         { }
 };