On Fri, Aug 04, 2023 at 09:28:42AM +0200, AngeloGioacchino Del Regno wrote:
> In preparation for adding a 12-bits gamma support for the DISP_GAMMA
> IP, remove the mtk_gamma_set_common() function and move the relevant
> bits in mtk_gamma_set() for DISP_GAMMA and mtk_aal_gamma_set() for
> DISP_AAL: since the latter has no more support for gamma manipulation
> (being moved to a different IP) in newer revisions, those functions
> are about to diverge and it makes no sense to keep a common one (with
> all the complications of passing common data and making exclusions
> for device driver data) for just a few bits.
>
> This commit brings no functional changes.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/mediatek/mtk_disp_aal.c | 39 +++++++++++++++++++++--
> drivers/gpu/drm/mediatek/mtk_disp_drv.h | 1 -
> drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 34 ++++----------------
> 3 files changed, 44 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_aal.c b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> index bec035780db0..21b25470e9b7 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> @@ -17,10 +17,18 @@
>
> #define DISP_AAL_EN 0x0000
> #define AAL_EN BIT(0)
> +#define DISP_AAL_CFG 0x0020
> +#define AAL_RELAY_MODE BIT(0)
> +#define AAL_GAMMA_LUT_EN BIT(1)
> #define DISP_AAL_SIZE 0x0030
> #define DISP_AAL_SIZE_HSIZE GENMASK(28, 16)
> #define DISP_AAL_SIZE_VSIZE GENMASK(12, 0)
> #define DISP_AAL_OUTPUT_SIZE 0x04d8
> +#define DISP_AAL_GAMMA_LUT 0x0700
> +#define DISP_AAL_GAMMA_LUT_R GENMASK(29, 20)
> +#define DISP_AAL_GAMMA_LUT_G GENMASK(19, 10)
> +#define DISP_AAL_GAMMA_LUT_B GENMASK(9, 0)
> +#define DISP_AAL_LUT_BITS 10
> #define DISP_AAL_LUT_SIZE 512
>
> struct mtk_disp_aal_data {
> @@ -85,9 +93,36 @@ unsigned int mtk_aal_gamma_get_lut_size(struct device *dev)
> void mtk_aal_gamma_set(struct device *dev, struct drm_crtc_state *state)
> {
> struct mtk_disp_aal *aal = dev_get_drvdata(dev);
> + struct drm_color_lut *lut;
> + unsigned int i;
> + u32 cfg_val;
> +
> + /* If gamma is not supported in AAL, go out immediately */
> + if (!(aal->data && aal->data->has_gamma))
> + return;
> +
> + /* Also, if there's no gamma lut there's nothing to do here. */
> + if (!state->gamma_lut)
> + return;
> +
> + cfg_val = readl(aal->regs + DISP_AAL_CFG);
> + lut = (struct drm_color_lut *)state->gamma_lut->data;
> +
> + for (i = 0; i < DISP_AAL_LUT_SIZE; i++) {
> + struct drm_color_lut hwlut = {
> + .red = drm_color_lut_extract(lut[i].red, DISP_AAL_LUT_BITS),
> + .green = drm_color_lut_extract(lut[i].green, DISP_AAL_LUT_BITS),
> + .blue = drm_color_lut_extract(lut[i].blue, DISP_AAL_LUT_BITS)
> + };
> + u32 word;
> +
> + word = FIELD_PREP(DISP_AAL_GAMMA_LUT_R, hwlut.red);
> + word |= FIELD_PREP(DISP_AAL_GAMMA_LUT_G, hwlut.green);
> + word |= FIELD_PREP(DISP_AAL_GAMMA_LUT_B, hwlut.blue);
> + writel(word, (aal->regs + DISP_AAL_GAMMA_LUT) + (i * 4));
> + }
Hi Angelo,
it looks like you're missing a
cfg_val |= FIELD_PREP(AAL_GAMMA_LUT_EN, 1);
to actually enable the AAL gamma table here, like was done in the common
function.
Thanks,
Nícolas
>
> - if (aal->data && aal->data->has_gamma)
> - mtk_gamma_set_common(NULL, aal->regs, state);
> + writel(cfg_val, aal->regs + DISP_AAL_CFG);
> }
[..]
