From d9f9565c1f7f51904a5009671595a50b8ab0462b Mon Sep 17 00:00:00 2001 From: Philippe CORNU Date: Mon, 23 Apr 2018 16:10:50 +0200 Subject: 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 Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20180423141054.13128-2-philippe.cornu@st.com --- drivers/gpu/drm/panel/panel-orisetech-otm8009a.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) (limited to 'drivers/gpu/drm/panel') diff --git a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c index 90f1ae4af93c..0fd2e0144d2b 100644 --- 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; } -- cgit v1.2.3