Subject: [PATCH v10 06/16] drm/mediatek: gamma: Use bitfield macros

Make the code more robust and improve readability by using bitfield
macros instead of open coding bit operations.
While at it, also add a definition for LUT_BITS_DEFAULT.

Signed-off-by: AngeloGioacchino Del Regno <[email protected]>
Reviewed-by: Jason-JH.Lin <[email protected]>
Reviewed-by: Alexandre Mergnat <[email protected]>
---
drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 41 ++++++++++++++---------
1 file changed, 26 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
index 18b102bef370..ea91d3619716 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
@@ -3,6 +3,7 @@
* Copyright (c) 2021 MediaTek Inc.
*/

+#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/module.h>
@@ -21,9 +22,16 @@
#define GAMMA_LUT_EN BIT(1)
#define GAMMA_DITHERING BIT(2)
#define DISP_GAMMA_SIZE 0x0030
+#define DISP_GAMMA_SIZE_HSIZE GENMASK(28, 16)
+#define DISP_GAMMA_SIZE_VSIZE GENMASK(12, 0)
#define DISP_GAMMA_LUT 0x0700

+#define DISP_GAMMA_LUT_10BIT_R GENMASK(29, 20)
+#define DISP_GAMMA_LUT_10BIT_G GENMASK(19, 10)
+#define DISP_GAMMA_LUT_10BIT_B GENMASK(9, 0)
+
#define LUT_10BIT_MASK 0x03ff
+#define LUT_BITS_DEFAULT 10
#define LUT_SIZE_DEFAULT 512

struct mtk_disp_gamma_data {
@@ -96,33 +104,33 @@ void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt
for (i = 0; i < lut_size; i++) {
struct drm_color_lut diff, hwlut;

- hwlut.red = drm_color_lut_extract(lut[i].red, 10);
- hwlut.green = drm_color_lut_extract(lut[i].green, 10);
- hwlut.blue = drm_color_lut_extract(lut[i].blue, 10);
+ hwlut.red = drm_color_lut_extract(lut[i].red, LUT_BITS_DEFAULT);
+ hwlut.green = drm_color_lut_extract(lut[i].green, LUT_BITS_DEFAULT);
+ hwlut.blue = drm_color_lut_extract(lut[i].blue, LUT_BITS_DEFAULT);

if (!lut_diff || (i % 2 == 0)) {
- word = hwlut.red << 20 +
- hwlut.green << 10 +
- hwlut.red;
+ word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R, hwlut.red);
+ word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_G, hwlut.green);
+ word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_B, hwlut.blue);
} else {
diff.red = lut[i].red - lut[i - 1].red;
- diff.red = drm_color_lut_extract(diff.red, 10);
+ diff.red = drm_color_lut_extract(diff.red, LUT_BITS_DEFAULT);

diff.green = lut[i].green - lut[i - 1].green;
- diff.green = drm_color_lut_extract(diff.green, 10);
+ diff.green = drm_color_lut_extract(diff.green, LUT_BITS_DEFAULT);

diff.blue = lut[i].blue - lut[i - 1].blue;
- diff.blue = drm_color_lut_extract(diff.blue, 10);
+ diff.blue = drm_color_lut_extract(diff.blue, LUT_BITS_DEFAULT);

- word = diff.blue << 20 +
- diff.green << 10 +
- diff.red;
+ word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R, diff.red);
+ word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_G, diff.green);
+ word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_B, diff.blue);
}
writel(word, (lut_base + i * 4));
}

/* Enable the gamma table */
- cfg_val = cfg_val | GAMMA_LUT_EN;
+ cfg_val |= FIELD_PREP(GAMMA_LUT_EN, 1);

writel(cfg_val, regs + DISP_GAMMA_CFG);
}
@@ -139,9 +147,12 @@ void mtk_gamma_config(struct device *dev, unsigned int w,
unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
+ u32 sz;
+
+ sz = FIELD_PREP(DISP_GAMMA_SIZE_HSIZE, w);
+ sz |= FIELD_PREP(DISP_GAMMA_SIZE_VSIZE, h);

- mtk_ddp_write(cmdq_pkt, h << 16 | w, &gamma->cmdq_reg, gamma->regs,
- DISP_GAMMA_SIZE);
+ mtk_ddp_write(cmdq_pkt, sz, &gamma->cmdq_reg, gamma->regs, DISP_GAMMA_SIZE);
if (gamma->data && gamma->data->has_dither)
mtk_dither_set_common(gamma->regs, &gamma->cmdq_reg, bpc,
DISP_GAMMA_CFG, GAMMA_DITHERING, cmdq_pkt);
--
2.41.0



2023-10-12 04:12:44

by CK Hu (胡俊光)

[permalink] [raw]
Subject: Re: [PATCH v10 06/16] drm/mediatek: gamma: Use bitfield macros

Hi, Angelo:

On Fri, 2023-08-04 at 09:28 +0200, AngeloGioacchino Del Regno wrote:
> Make the code more robust and improve readability by using bitfield
> macros instead of open coding bit operations.
> While at it, also add a definition for LUT_BITS_DEFAULT.
>
> Signed-off-by: AngeloGioacchino Del Regno <
> [email protected]>
> Reviewed-by: Jason-JH.Lin <[email protected]>
> Reviewed-by: Alexandre Mergnat <[email protected]>
> ---
> drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 41 ++++++++++++++-------
> --
> 1 file changed, 26 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> index 18b102bef370..ea91d3619716 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> @@ -3,6 +3,7 @@
> * Copyright (c) 2021 MediaTek Inc.
> */
>
> +#include <linux/bitfield.h>
> #include <linux/clk.h>
> #include <linux/component.h>
> #include <linux/module.h>
> @@ -21,9 +22,16 @@
> #define GAMMA_LUT_EN BIT(1)
> #define GAMMA_DITHERING BIT(2)
> #define DISP_GAMMA_SIZE 0x0030
> +#define DISP_GAMMA_SIZE_HSIZE GENMASK
> (28, 16)
> +#define DISP_GAMMA_SIZE_VSIZE GENMASK
> (12, 0)
> #define DISP_GAMMA_LUT 0x0700
>
> +#define DISP_GAMMA_LUT_10BIT_R GENMASK(29, 20)
> +#define DISP_GAMMA_LUT_10BIT_G GENMASK(19, 10)
> +#define DISP_GAMMA_LUT_10BIT_B GENMASK(9, 0)
> +
> #define LUT_10BIT_MASK 0x03ff
> +#define LUT_BITS_DEFAULT 10
> #define LUT_SIZE_DEFAULT 512
>
> struct mtk_disp_gamma_data {
> @@ -96,33 +104,33 @@ void mtk_gamma_set_common(struct device *dev,
> void __iomem *regs, struct drm_crt
> for (i = 0; i < lut_size; i++) {
> struct drm_color_lut diff, hwlut;
>
> - hwlut.red = drm_color_lut_extract(lut[i].red, 10);
> - hwlut.green = drm_color_lut_extract(lut[i].green, 10);
> - hwlut.blue = drm_color_lut_extract(lut[i].blue, 10);
> + hwlut.red = drm_color_lut_extract(lut[i].red,
> LUT_BITS_DEFAULT);

You finally drop LUT_BITS_DEFAULT, so it's not necessary to introduce
it in this patch. Let this patch only use bitfield macros.

Regards,
CK

> + hwlut.green = drm_color_lut_extract(lut[i].green,
> LUT_BITS_DEFAULT);
> + hwlut.blue = drm_color_lut_extract(lut[i].blue,
> LUT_BITS_DEFAULT);
>
> if (!lut_diff || (i % 2 == 0)) {
> - word = hwlut.red << 20 +
> - hwlut.green << 10 +
> - hwlut.red;
> + word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R,
> hwlut.red);
> + word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_G,
> hwlut.green);
> + word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_B,
> hwlut.blue);
> } else {
> diff.red = lut[i].red - lut[i - 1].red;
> - diff.red = drm_color_lut_extract(diff.red, 10);
> + diff.red = drm_color_lut_extract(diff.red,
> LUT_BITS_DEFAULT);
>
> diff.green = lut[i].green - lut[i - 1].green;
> - diff.green = drm_color_lut_extract(diff.green,
> 10);
> + diff.green = drm_color_lut_extract(diff.green,
> LUT_BITS_DEFAULT);
>
> diff.blue = lut[i].blue - lut[i - 1].blue;
> - diff.blue = drm_color_lut_extract(diff.blue,
> 10);
> + diff.blue = drm_color_lut_extract(diff.blue,
> LUT_BITS_DEFAULT);
>
> - word = diff.blue << 20 +
> - diff.green << 10 +
> - diff.red;
> + word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R,
> diff.red);
> + word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_G,
> diff.green);
> + word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_B,
> diff.blue);
> }
> writel(word, (lut_base + i * 4));
> }
>
> /* Enable the gamma table */
> - cfg_val = cfg_val | GAMMA_LUT_EN;
> + cfg_val |= FIELD_PREP(GAMMA_LUT_EN, 1);
>
> writel(cfg_val, regs + DISP_GAMMA_CFG);
> }
> @@ -139,9 +147,12 @@ void mtk_gamma_config(struct device *dev,
> unsigned int w,
> unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
> {
> struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
> + u32 sz;
> +
> + sz = FIELD_PREP(DISP_GAMMA_SIZE_HSIZE, w);
> + sz |= FIELD_PREP(DISP_GAMMA_SIZE_VSIZE, h);
>
> - mtk_ddp_write(cmdq_pkt, h << 16 | w, &gamma->cmdq_reg, gamma-
> >regs,
> - DISP_GAMMA_SIZE);
> + mtk_ddp_write(cmdq_pkt, sz, &gamma->cmdq_reg, gamma->regs,
> DISP_GAMMA_SIZE);
> if (gamma->data && gamma->data->has_dither)
> mtk_dither_set_common(gamma->regs, &gamma->cmdq_reg,
> bpc,
> DISP_GAMMA_CFG, GAMMA_DITHERING,
> cmdq_pkt);