Commit a82db604 authored by Michael Riesch's avatar Michael Riesch Committed by Neil Armstrong
Browse files

drm/panel: sitronix-st7789v: add support for partial mode 



The ST7789V controller features support for the partial mode. Here,
the area to be displayed can be restricted in one direction (by default,
in vertical direction). This is useful for panels that are partially
occluded by design. Add support for the partial mode.

Signed-off-by: default avatarMichael Riesch <michael.riesch@wolfvision.net>
Reviewed-by: default avatarNeil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: default avatarNeil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230718-feature-lcd-panel-v2-3-2485ca07b49d@wolfvision.net
parent a5382e35

drivers/gpu/drm/panel/panel-sitronix-st7789v.c

+41 −2
Original line number Diff line number Diff line
@@ -118,6 +118,9 @@ struct st7789_panel_info { 
	u32 bus_format;

	u32 bus_flags;

	bool invert_mode;

	bool partial_mode;

	u16 partial_start;

	u16 partial_end;

};



struct st7789v {
@@ -345,9 +348,14 @@ static enum drm_panel_orientation st7789v_get_orientation(struct drm_panel *p) 
static int st7789v_prepare(struct drm_panel *panel)

{

	struct st7789v *ctx = panel_to_st7789v(panel);

	u8 pixel_fmt, polarity;

	u8 mode, pixel_fmt, polarity;

	int ret;



	if (!ctx->info->partial_mode)

		mode = ST7789V_RGBCTRL_WO;

	else

		mode = 0;



	switch (ctx->info->bus_format) {

	case MEDIA_BUS_FMT_RGB666_1X18:

		pixel_fmt = MIPI_DCS_PIXEL_FMT_18BIT;
@@ -487,6 +495,37 @@ static int st7789v_prepare(struct drm_panel *panel) 
						MIPI_DCS_EXIT_INVERT_MODE));

	}



	if (ctx->info->partial_mode) {

		u8 area_data[4] = {

			(ctx->info->partial_start >> 8) & 0xff,

			(ctx->info->partial_start >> 0) & 0xff,

			((ctx->info->partial_end - 1) >> 8) & 0xff,

			((ctx->info->partial_end - 1) >> 0) & 0xff,

		};



		/* Caution: if userspace ever pushes a mode different from the

		 * expected one (i.e., the one advertised by get_modes), we'll

		 * add margins.

		 */



		ST7789V_TEST(ret, st7789v_write_command(

					  ctx, MIPI_DCS_ENTER_PARTIAL_MODE));



		ST7789V_TEST(ret, st7789v_write_command(

					  ctx, MIPI_DCS_SET_PAGE_ADDRESS));

		ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[0]));

		ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[1]));

		ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[2]));

		ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[3]));



		ST7789V_TEST(ret, st7789v_write_command(

					  ctx, MIPI_DCS_SET_PARTIAL_ROWS));

		ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[0]));

		ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[1]));

		ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[2]));

		ST7789V_TEST(ret, st7789v_write_data(ctx, area_data[3]));

	}



	ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RAMCTRL_CMD));

	ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_DM_RGB |

					     ST7789V_RAMCTRL_RM_RGB));
@@ -494,7 +533,7 @@ static int st7789v_prepare(struct drm_panel *panel) 
					     ST7789V_RAMCTRL_MAGIC));



	ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RGBCTRL_CMD));

	ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_WO |

	ST7789V_TEST(ret, st7789v_write_data(ctx, mode |

					     ST7789V_RGBCTRL_RCM(2) |

					     polarity));

	ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_VBP(8)));