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.
Cc: Stephan Gerhold <stephan@xxxxxxxxxxx>
Cc: Paweł Chmiel <pawel.mikolaj.chmiel@xxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
.../gpu/drm/panel/panel-samsung-s6e63m0-spi.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c
index 75f00ed4810b..9e1552a7ccc7 100644
--- a/drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c
@@ -13,13 +13,20 @@
static int s6e63m0_spi_dcs_read(struct device *dev, const u8 cmd, u8 *data)
{
- /*
- * FIXME: implement reading DCS commands over SPI so we can
- * properly identify which physical panel is connected.
- */
- *data = 0;
+ struct spi_device *spi = to_spi_device(dev);
+ u16 buf[1];
+ u16 rbuf[1];
+ int ret;
- 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)
--
2.26.2
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
