diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c index 75f00ed4810b..94ae4ac5a88e 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)