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drm/stm: ltdc: add clut mode support 

Add the 8-bit clut mode support at crtc level.
Useful for low memory footprint user interfaces but also for
8-bit old games (including color shifting visual effects).
Tested with fbdev FBIOPUTCMAP & drm DRM_IOCTL_MODE_SETGAMMA
ioctls.

Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1509016666-18927-1-git-send-email-philippe.cornu@st.com
This commit is contained in:
Philippe CORNU 2017-10-26 13:17:46 +02:00 committed by Benjamin Gaignard
parent c4712f27be
commit b706a25eae
1 changed files with 30 additions and 0 deletions
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30
drivers/gpu/drm/stm/ltdc.c
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@ -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 */