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| author | Eric Anholt <eric@anholt.net> | 2017-10-31 12:32:58 -0700 |
|---|---|---|
| committer | Hoegeun Kwon <hoegeun.kwon@samsung.com> | 2019-02-19 09:07:54 +0900 |
| commit | 9abf8d83968528a4f615c6ccbb7324b22c35252c (patch) | |
| tree | 9f9e9088ac70a53603595985da4abe231cea147a | |
| parent | 000dd4be9ae28113d4242fd710737968b6e46569 (diff) | |
| download | linux-rpi3-9abf8d83968528a4f615c6ccbb7324b22c35252c.tar.gz linux-rpi3-9abf8d83968528a4f615c6ccbb7324b22c35252c.tar.bz2 linux-rpi3-9abf8d83968528a4f615c6ccbb7324b22c35252c.zip | |
drm/panel: Enable DSI transactions on the RPi panel.
It turns out that I had just mistaken what type of write the register
writes were supposed to be, using DCS instead of generic long writes.
Switching to transactions instead of using the atmel as a bridge also
seems to resolve the sparkling pixels problem I've had.
Signed-off-by: Eric Anholt <eric@anholt.net>
Fixes: 2f733d6194bd ("drm/panel: Add support for the Raspberry Pi 7" Touchscreen.")
Link: https://patchwork.freedesktop.org/patch/msgid/20171031193258.17373-2-eric@anholt.net
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
Acked-by: Thierry Reding <treding@nvidia.com>
[hoegeun.kwon: backported from mainline - commit: 3481fe768faea
There is a problem that the pixel sparking. So use generic writes
instead of dsc.]
Change-Id: Ie032f351248a2e263e9594db8df71da163ff2e00
Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
| -rw-r--r-- | drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 14 |
1 files changed, 1 insertions, 13 deletions
diff --git a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c index 186969f148e1..996ef5a02cee 100644 --- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c +++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c @@ -243,12 +243,6 @@ static void rpi_touchscreen_i2c_write(struct rpi_touchscreen *ts, static int rpi_touchscreen_write(struct rpi_touchscreen *ts, u16 reg, u32 val) { -#if 0 - /* The firmware uses LP DSI transactions like this to bring up - * the hardware, which should be faster than using I2C to then - * pass to the Toshiba. However, I was unable to get it to - * work. - */ u8 msg[] = { reg, reg >> 8, @@ -258,13 +252,7 @@ static int rpi_touchscreen_write(struct rpi_touchscreen *ts, u16 reg, u32 val) val >> 24, }; - mipi_dsi_dcs_write_buffer(ts->dsi, msg, sizeof(msg)); -#else - rpi_touchscreen_i2c_write(ts, REG_WR_ADDRH, reg >> 8); - rpi_touchscreen_i2c_write(ts, REG_WR_ADDRL, reg); - rpi_touchscreen_i2c_write(ts, REG_WRITEH, val >> 8); - rpi_touchscreen_i2c_write(ts, REG_WRITEL, val); -#endif + mipi_dsi_generic_write(ts->dsi, msg, sizeof(msg)); return 0; } |