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drm/panel: sitronix-st7789v: avoid hardcoding polarity info

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Add polarity information via mode and bus flags, so that they are no
longer hardcoded and forward the information to the DRM stack. This is
required for adding panels with different settings.

Reviewed-by: Michael Riesch <michael.riesch@wolfvision.net>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230714013756.1546769-13-sre@kernel.org
This commit is contained in:
Sebastian Reichel 2023-07-14 03:37:49 +02:00 committed by Neil Armstrong
parent 7a6288726c
commit e4572f99f8
1 changed files with 18 additions and 4 deletions
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22
drivers/gpu/drm/panel/panel-sitronix-st7789v.c
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@ -28,6 +28,7 @@
#define ST7789V_RGBCTRL_VSYNC_HIGH BIT(3)
#define ST7789V_RGBCTRL_HSYNC_HIGH BIT(2)
#define ST7789V_RGBCTRL_PCLK_HIGH BIT(1)
#define ST7789V_RGBCTRL_DE_LOW BIT(0)
#define ST7789V_RGBCTRL_VBP(n) ((n) & 0x7f)
#define ST7789V_RGBCTRL_HBP(n) ((n) & 0x1f)
@ -112,6 +113,7 @@
struct st7789_panel_info {
const struct drm_display_mode *mode;
u32 bus_format;
u32 bus_flags;
bool invert_mode;
};
@ -168,12 +170,15 @@ static const struct drm_display_mode default_mode = {
.vtotal = 320 + 8 + 4 + 4,
.width_mm = 61,
.height_mm = 103,
.flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC,
};
static const struct st7789_panel_info default_panel = {
.mode = &default_mode,
.invert_mode = true,
.bus_format = MEDIA_BUS_FMT_RGB666_1X18,
.bus_flags = DRM_BUS_FLAG_DE_HIGH |
DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE,
};
static int st7789v_get_modes(struct drm_panel *panel,
@ -198,6 +203,7 @@ static int st7789v_get_modes(struct drm_panel *panel,
connector->display_info.bpc = 6;
connector->display_info.width_mm = ctx->info->mode->width_mm;
connector->display_info.height_mm = ctx->info->mode->height_mm;
connector->display_info.bus_flags = ctx->info->bus_flags;
drm_display_info_set_bus_formats(&connector->display_info,
&ctx->info->bus_format, 1);
@ -207,7 +213,7 @@ static int st7789v_get_modes(struct drm_panel *panel,
static int st7789v_prepare(struct drm_panel *panel)
{
struct st7789v *ctx = panel_to_st7789v(panel);
u8 pixel_fmt;
u8 pixel_fmt, polarity;
int ret;
switch (ctx->info->bus_format) {
@ -225,6 +231,16 @@ static int st7789v_prepare(struct drm_panel *panel)
pixel_fmt = (pixel_fmt << 4) | pixel_fmt;
polarity = 0;
if (ctx->info->mode->flags & DRM_MODE_FLAG_PVSYNC)
polarity |= ST7789V_RGBCTRL_VSYNC_HIGH;
if (ctx->info->mode->flags & DRM_MODE_FLAG_PHSYNC)
polarity |= ST7789V_RGBCTRL_HSYNC_HIGH;
if (ctx->info->bus_flags & DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE)
polarity |= ST7789V_RGBCTRL_PCLK_HIGH;
if (ctx->info->bus_flags & DRM_BUS_FLAG_DE_LOW)
polarity |= ST7789V_RGBCTRL_DE_LOW;
ret = regulator_enable(ctx->power);
if (ret)
return ret;
@ -340,9 +356,7 @@ static int st7789v_prepare(struct drm_panel *panel)
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RGBCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_WO |
ST7789V_RGBCTRL_RCM(2) |
ST7789V_RGBCTRL_VSYNC_HIGH |
ST7789V_RGBCTRL_HSYNC_HIGH |
ST7789V_RGBCTRL_PCLK_HIGH));
polarity));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_VBP(8)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_HBP(20)));