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drm/panel: s6e63m0: Implement reading from panel 

This code was found in the Samsung vendor tree for the
Samsung GT-I9070 mobile phone. Let's support reading before
we implement the 3WIRE protocol for both reading and
writing.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Stephan Gerhold <stephan@gerhold.net>
Cc: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201110234653.2248594-3-linus.walleij@linaro.org
This commit is contained in:
Linus Walleij 2020-11-11 00:46:50 +01:00
parent 49ef0c6d7d
commit 1b72ea1eaa
1 changed files with 13 additions and 6 deletions
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19
drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c
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@ -13,13 +13,20 @@
static int s6e63m0_spi_dcs_read(struct device *dev, const u8 cmd, u8 *data) static int s6e63m0_spi_dcs_read(struct device *dev, const u8 cmd, u8 *data)
{ {
/* struct spi_device *spi = to_spi_device(dev);
* FIXME: implement reading DCS commands over SPI so we can u16 buf[1];
* properly identify which physical panel is connected. u16 rbuf[1];
*/ int ret;
*data = 0;
return 0; /* SPI buffers are always in CPU order */
buf[0] = (u16)cmd;
ret = spi_write_then_read(spi, buf, 2, rbuf, 2);
dev_dbg(dev, "READ CMD: %04x RET: %04x\n", buf[0], rbuf[0]);
if (!ret)
/* These high 8 bits of the 9 contains the readout */
*data = (rbuf[0] & 0x1ff) >> 1;
return ret;
} }
static int s6e63m0_spi_write_word(struct device *dev, u16 data) static int s6e63m0_spi_write_word(struct device *dev, u16 data)