DRM: ingenic: Add support for Sharp panels

Add support for the LCD panels that must be driven with the
Sharp-specific signals SPL, CLS, REV, PS.

An example of such panel is the LS020B1DD01D supported by the
panel-simple DRM panel driver.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20190627182114.27299-2-paul@crapouillou.net
# *** extracted tags ***
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c
index 02c4788..da966f3 100644 (file)
--- a/drivers/gpu/drm/ingenic/ingenic-drm.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
@@ -166,6 +166,8 @@ struct ingenic_drm {
 
        struct ingenic_dma_hwdesc *dma_hwdesc;
        dma_addr_t dma_hwdesc_phys;
+
+       bool panel_is_sharp;
 };
 
 static const u32 ingenic_drm_primary_formats[] = {
@@ -283,6 +285,13 @@ static void ingenic_drm_crtc_update_timings(struct ingenic_drm *priv,
        regmap_write(priv->map, JZ_REG_LCD_DAV,
                     vds << JZ_LCD_DAV_VDS_OFFSET |
                     vde << JZ_LCD_DAV_VDE_OFFSET);
+
+       if (priv->panel_is_sharp) {
+               regmap_write(priv->map, JZ_REG_LCD_PS, hde << 16 | (hde + 1));
+               regmap_write(priv->map, JZ_REG_LCD_CLS, hde << 16 | (hde + 1));
+               regmap_write(priv->map, JZ_REG_LCD_SPL, hpe << 16 | (hpe + 1));
+               regmap_write(priv->map, JZ_REG_LCD_REV, mode->htotal << 16);
+       }
 }
 
 static void ingenic_drm_crtc_update_ctrl(struct ingenic_drm *priv,
@@ -378,11 +387,18 @@ static void ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder,
 {
        struct ingenic_drm *priv = drm_encoder_get_priv(encoder);
        struct drm_display_mode *mode = &crtc_state->adjusted_mode;
-       struct drm_display_info *info = &conn_state->connector->display_info;
-       unsigned int cfg = JZ_LCD_CFG_PS_DISABLE
-                        | JZ_LCD_CFG_CLS_DISABLE
-                        | JZ_LCD_CFG_SPL_DISABLE
-                        | JZ_LCD_CFG_REV_DISABLE;
+       struct drm_connector *conn = conn_state->connector;
+       struct drm_display_info *info = &conn->display_info;
+       unsigned int cfg;
+
+       priv->panel_is_sharp = info->bus_flags & DRM_BUS_FLAG_SHARP_SIGNALS;
+
+       if (priv->panel_is_sharp) {
+               cfg = JZ_LCD_CFG_MODE_SPECIAL_TFT_1 | JZ_LCD_CFG_REV_POLARITY;
+       } else {
+               cfg = JZ_LCD_CFG_PS_DISABLE | JZ_LCD_CFG_CLS_DISABLE
+                   | JZ_LCD_CFG_SPL_DISABLE | JZ_LCD_CFG_REV_DISABLE;
+       }
 
        if (mode->flags & DRM_MODE_FLAG_NHSYNC)
                cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
@@ -393,24 +409,26 @@ static void ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder,
        if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
                cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
 
-       if (conn_state->connector->connector_type == DRM_MODE_CONNECTOR_TV) {
-               if (mode->flags & DRM_MODE_FLAG_INTERLACE)
-                       cfg |= JZ_LCD_CFG_MODE_TV_OUT_I;
-               else
-                       cfg |= JZ_LCD_CFG_MODE_TV_OUT_P;
-       } else {
-               switch (*info->bus_formats) {
-               case MEDIA_BUS_FMT_RGB565_1X16:
-                       cfg |= JZ_LCD_CFG_MODE_GENERIC_16BIT;
-                       break;
-               case MEDIA_BUS_FMT_RGB666_1X18:
-                       cfg |= JZ_LCD_CFG_MODE_GENERIC_18BIT;
-                       break;
-               case MEDIA_BUS_FMT_RGB888_1X24:
-                       cfg |= JZ_LCD_CFG_MODE_GENERIC_24BIT;
-                       break;
-               default:
-                       break;
+       if (!priv->panel_is_sharp) {
+               if (conn->connector_type == DRM_MODE_CONNECTOR_TV) {
+                       if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+                               cfg |= JZ_LCD_CFG_MODE_TV_OUT_I;
+                       else
+                               cfg |= JZ_LCD_CFG_MODE_TV_OUT_P;
+               } else {
+                       switch (*info->bus_formats) {
+                       case MEDIA_BUS_FMT_RGB565_1X16:
+                               cfg |= JZ_LCD_CFG_MODE_GENERIC_16BIT;
+                               break;
+                       case MEDIA_BUS_FMT_RGB666_1X18:
+                               cfg |= JZ_LCD_CFG_MODE_GENERIC_18BIT;
+                               break;
+                       case MEDIA_BUS_FMT_RGB888_1X24:
+                               cfg |= JZ_LCD_CFG_MODE_GENERIC_24BIT;
+                               break;
+                       default:
+                               break;
+                       }
                }
        }