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Commit 6470b7dd authored by Linus Walleij's avatar Linus Walleij
Browse files

drm/pl111: Handle the Versatile RGB/BGR565 mode 



The ARM Versatile series can do RGB/BGR565 with an external
"PLD" (Programmable Logical Device). However the CLCD does not
have control bits for this, so it needs to be set into the
ordinary 16BPP mode, then the RGB/BGR565 handling of the pixel
data is handled by configuring the PLD through the external
register.

Reviewed-by: default avatarEric Anholt <eric@anholt.net>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180206093540.8147-2-linus.walleij@linaro.org
parent 3d95f76a

drivers/gpu/drm/pl111/pl111_display.c

+13 −2
Original line number Diff line number Diff line
@@ -199,10 +199,17 @@ static void pl111_display_enable(struct drm_simple_display_pipe *pipe, 
		cntl |= CNTL_LCDBPP24 | CNTL_BGR;

		break;

	case DRM_FORMAT_BGR565:

		if (priv->variant->is_pl110)

			cntl |= CNTL_LCDBPP16;

		else

			cntl |= CNTL_LCDBPP16_565;

		break;

	case DRM_FORMAT_RGB565:

		cntl |= CNTL_LCDBPP16_565 | CNTL_BGR;

		if (priv->variant->is_pl110)

			cntl |= CNTL_LCDBPP16;

		else

			cntl |= CNTL_LCDBPP16_565;

		cntl |= CNTL_BGR;

		break;

	case DRM_FORMAT_ABGR1555:

	case DRM_FORMAT_XBGR1555:
@@ -226,6 +233,10 @@ static void pl111_display_enable(struct drm_simple_display_pipe *pipe, 
		break;

	}



	/* The PL110 in Integrator/Versatile does the BGR routing externally */

	if (priv->variant->external_bgr)

		cntl &= ~CNTL_BGR;



	/* Power sequence: first enable and chill */

	writel(cntl, priv->regs + priv->ctrl);