add gamma_set function, and we can also use it to adjust the brightness of the
display.
Signed-off-by: Zhihui Chen <chenzhihui4@xxxxxxxxxx>
---
.../gpu/drm/hisilicon/hibmc/hibmc_drm_de.c | 37 +++++++++++++++++++
.../gpu/drm/hisilicon/hibmc/hibmc_drm_regs.h | 5 +++
2 files changed, 42 insertions(+)
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
index 24de937c1cb1..f1ce6cb099d0 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
@@ -456,6 +456,42 @@ static void hibmc_crtc_disable_vblank(struct drm_crtc *crtc)
priv->mmio + HIBMC_RAW_INTERRUPT_EN);
}
+static void hibmc_crtc_load_lut(struct drm_crtc *crtc)
+{
+ struct hibmc_drm_private *priv = crtc->dev->dev_private;
+ void __iomem *mmio = priv->mmio;
+ u16 *r, *g, *b;
+ unsigned int reg;
+ int i;
+
+ r = crtc->gamma_store;
+ g = r + crtc->gamma_size;
+ b = g + crtc->gamma_size;
+
+ for (i = 0; i < crtc->gamma_size; i++) {
+ unsigned int offset = i << 2;
+ u8 red = *r++ >> 8;
+ u8 green = *g++ >> 8;
+ u8 blue = *b++ >> 8;
+ u32 rgb = (red << 16) | (green << 8) | blue;
+
+ writel(rgb, mmio + HIBMC_CRT_PALETTE + offset);
+ }
+
+ reg = readl(priv->mmio + HIBMC_CRT_DISP_CTL);
+ reg |= HIBMC_FIELD(HIBMC_CTL_DISP_CTL_GAMMA, 1);
+ writel(reg, priv->mmio + HIBMC_CRT_DISP_CTL);
+}
+
+static int hibmc_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
+ u16 *blue, uint32_t size,
+ struct drm_modeset_acquire_ctx *ctx)
+{
+ hibmc_crtc_load_lut(crtc);
+
+ return 0;
+}
+
static const struct drm_crtc_funcs hibmc_crtc_funcs = {
.page_flip = drm_atomic_helper_page_flip,
.set_config = drm_atomic_helper_set_config,
@@ -465,6 +501,7 @@ static const struct drm_crtc_funcs hibmc_crtc_funcs = {
.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
.enable_vblank = hibmc_crtc_enable_vblank,
.disable_vblank = hibmc_crtc_disable_vblank,
+ .gamma_set = hibmc_crtc_gamma_set,
};
static const struct drm_crtc_helper_funcs hibmc_crtc_helper_funcs = {
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_regs.h b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_regs.h
index b9e20cfcfb5a..9b7e85947113 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_regs.h
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_regs.h
@@ -91,6 +91,9 @@
#define HIBMC_CRT_DISP_CTL_TIMING(x) ((x) << 8)
#define HIBMC_CRT_DISP_CTL_TIMING_MASK 0x100
+#define HIBMC_CTL_DISP_CTL_GAMMA(x) ((x) << 3)
+#define HIBMC_CTL_DISP_CTL_GAMMA_MASK 0x08
+
#define HIBMC_CRT_DISP_CTL_PLANE(x) ((x) << 2)
#define HIBMC_CRT_DISP_CTL_PLANE_MASK 4
@@ -193,5 +196,7 @@
#define CRT_PLL2_HS_148MHZ 0xB0CCCCCD
#define CRT_PLL2_HS_193MHZ 0xC0872B02
+#define HIBMC_CRT_PALETTE 0x80C00
+
#define HIBMC_FIELD(field, value) (field(value) & field##_MASK)
#endif
--
2.20.1
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
