drm/stm: ltdc: add clut mode support (b706a25e) · Commits · 戴 / test

drivers/gpu/drm/stm/ltdc.c

+30 −0

Original line number	Diff line number	Diff line
		@@ -175,6 +175,8 @@

		#define LXCFBLNR_CFBLN GENMASK(10, 0) /* Color Frame Buffer Line Number */

		#define CLUT_SIZE 256

		#define CONSTA_MAX 0xFF /* CONSTant Alpha MAX= 1.0 */
		#define BF1_PAXCA 0x600 /* Pixel Alpha x Constant Alpha */
		#define BF1_CA 0x400 /* Constant Alpha */
		@@ -363,6 +365,28 @@ static irqreturn_t ltdc_irq(int irq, void *arg)
		* DRM_CRTC
		*/

		static void ltdc_crtc_update_clut(struct drm_crtc *crtc)
		{
		struct ltdc_device *ldev = crtc_to_ltdc(crtc);
		struct drm_color_lut *lut;
		u32 val;
		int i;

		if (!crtc \|\| !crtc->state)
		return;

		if (!crtc->state->color_mgmt_changed \|\| !crtc->state->gamma_lut)
		return;

		lut = (struct drm_color_lut *)crtc->state->gamma_lut->data;

		for (i = 0; i < CLUT_SIZE; i++, lut++) {
		val = ((lut->red << 8) & 0xff0000) \| (lut->green & 0xff00) \|
		(lut->blue >> 8) \| (i << 24);
		reg_write(ldev->regs, LTDC_L1CLUTWR, val);
		}
		}

		static void ltdc_crtc_atomic_enable(struct drm_crtc *crtc,
		struct drm_crtc_state *old_state)
		{
		@@ -486,6 +510,8 @@ static void ltdc_crtc_atomic_flush(struct drm_crtc *crtc,

		DRM_DEBUG_ATOMIC("\n");

		ltdc_crtc_update_clut(crtc);

		/* Commit shadow registers = update planes at next vblank */
		reg_set(ldev->regs, LTDC_SRCR, SRCR_VBR);

		@@ -533,6 +559,7 @@ static const struct drm_crtc_funcs ltdc_crtc_funcs = {
		.reset = drm_atomic_helper_crtc_reset,
		.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
		.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
		.gamma_set = drm_atomic_helper_legacy_gamma_set,
		};

		/*
		@@ -765,6 +792,9 @@ static int ltdc_crtc_init(struct drm_device ddev, struct drm_crtc crtc)

		drm_crtc_helper_add(crtc, &ltdc_crtc_helper_funcs);

		drm_mode_crtc_set_gamma_size(crtc, CLUT_SIZE);
		drm_crtc_enable_color_mgmt(crtc, 0, false, CLUT_SIZE);

		DRM_DEBUG_DRIVER("CRTC:%d created\n", crtc->base.id);

		/* Add planes. Note : the first layer is used by primary plane */

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