drm/panel: s6e63m0: Implement reading from panel (1b72ea1e) · Commits · 戴 / test

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

drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c

+13 −6

Original line number	Diff line number	Diff line
		@@ -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)

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