video: ARM CLCD: support pads connected in reverse order
There are CLCDs connected with the pads in BGR rather than RGB order. It really doesn't matter since the CLCD has a flag and a bit to switch the position of the RGB and BGR components. This is needed to put something logical into the arm,pl11x,tft-r0g0b0-pads property of the device tree on the Nomadik which will then be <16 8 0>. Cc: Pawel Moll <pawel.moll@arm.com> Cc: Rob Herring <robh@kernel.org> Cc: Russell King <linux@arm.linux.org.uk> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
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committed by
Tomi Valkeinen

parent
af29897f10
commit
03d14c36af
@@ -108,6 +108,12 @@ struct clcd_panel {
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grayscale:1;
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unsigned int connector;
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struct backlight_device *backlight;
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/*
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* If the B/R lines are switched between the CLCD
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* and the panel we need to know this and not try to
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* compensate with the BGR bit in the control register.
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*/
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bool bgr_connection;
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};
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struct clcd_regs {
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@@ -234,16 +240,22 @@ static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
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if (var->grayscale)
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val |= CNTL_LCDBW;
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if (fb->panel->caps && fb->board->caps &&
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var->bits_per_pixel >= 16) {
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if (fb->panel->caps && fb->board->caps && var->bits_per_pixel >= 16) {
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/*
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* if board and panel supply capabilities, we can support
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* changing BGR/RGB depending on supplied parameters
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* changing BGR/RGB depending on supplied parameters. Here
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* we switch to what the framebuffer is providing if need
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* be, so if the framebuffer is BGR but the display connection
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* is RGB (first case) we switch it around. Vice versa mutatis
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* mutandis if the framebuffer is RGB but the display connection
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* is BGR, we flip it around.
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*/
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if (var->red.offset == 0)
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val &= ~CNTL_BGR;
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else
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val |= CNTL_BGR;
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if (fb->panel->bgr_connection)
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val ^= CNTL_BGR;
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}
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switch (var->bits_per_pixel) {
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