drm/panel: otm8009a: Fix backlight updates

Backlight updates was not working anymore since the good implementation
of the DSI low-power mode in the DSI host driver. After a longer
analysis, the backlight updates in DSI video mode require the DSI high-
speed mode.

Note: it is important to keep the DSI low-power mode for the rest of the
driver as init sequence, sleep in/out... DSI commands work in low-power
mode.

Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180423141054.13128-2-philippe.cornu@st.com

diff --git a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
index 90f1ae4..0fd2e01 100644 (file)
--- a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
+++ b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
@@ -98,6 +98,20 @@ static void otm8009a_dcs_write_buf(struct otm8009a *ctx, const void *data,
                DRM_WARN("mipi dsi dcs write buffer failed\n");
 }
 
+static void otm8009a_dcs_write_buf_hs(struct otm8009a *ctx, const void *data,
+                                     size_t len)
+{
+       struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+
+       /* data will be sent in dsi hs mode (ie. no lpm) */
+       dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+       otm8009a_dcs_write_buf(ctx, data, len);
+
+       /* restore back the dsi lpm mode */
+       dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+}
+
 #define dcs_write_seq(ctx, seq...)                     \
 ({                                                     \
        static const u8 d[] = { seq };                  \
@@ -387,7 +401,7 @@ static int otm8009a_backlight_update_status(struct backlight_device *bd)
                 */
                data[0] = MIPI_DCS_SET_DISPLAY_BRIGHTNESS;
                data[1] = bd->props.brightness;
-               otm8009a_dcs_write_buf(ctx, data, ARRAY_SIZE(data));
+               otm8009a_dcs_write_buf_hs(ctx, data, ARRAY_SIZE(data));
 
                /* set Brightness Control & Backlight on */
                data[1] = 0x24;
@@ -399,7 +413,7 @@ static int otm8009a_backlight_update_status(struct backlight_device *bd)
 
        /* Update Brightness Control & Backlight */
        data[0] = MIPI_DCS_WRITE_CONTROL_DISPLAY;
-       otm8009a_dcs_write_buf(ctx, data, ARRAY_SIZE(data));
+       otm8009a_dcs_write_buf_hs(ctx, data, ARRAY_SIZE(data));
 
        return 0;
 }