On Mon, 23 Dec 2019 at 15:50, Zhihui Chen wrote:
> add gamma_set function, and we can also use it to adjust the brightness of
> the
> display.
>
> Signed-off-by: Zhihui Chen
>
Thanks for the patch.
Acked-by: Xinliang Liu
Applied to drm-misc-next.
> ---
> .../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 0xB0CD
> #define CRT_PLL2_HS_193MHZ 0xC0872B02
>
> +#define HIBMC_CRT_PALETTE 0x80C00
> +
> #define HIBMC_FIELD(field, value) (field(value) & field##_MASK)
> #endif
> --
> 2.20.1
>
>
>
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