From: Philippe CORNU <philippe.cornu@st.com>
Date: Mon, 23 Apr 2018 16:10:50 +0200
Subject: drm/panel: otm8009a: Fix backlight updates
Git-commit: d9f9565c1f7f51904a5009671595a50b8ab0462b
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
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
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/panel/panel-orisetech-otm8009a.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
--- 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(struc
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_sta
*/
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_sta
/* 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;
}