Commit c1cdee9b authored by Marek Vasut's avatar Marek Vasut
Browse files

drm/panel/panel-sitronix-st7701: Fix RTNI calculation 



The RTNI field is multiplied by 16 and incremented by 512 before being
used as the minimum number of pixel clock per horizontal line, hence
it is necessary to subtract those 512 bytes from htotal and then divide
the result by 16 before writing the value into the RTNI field. Fix the
calculation.

Fixes: de2b4917 ("drm/panel/panel-sitronix-st7701: Infer horizontal pixel count from TFT mode")
Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221012221159.88397-1-marex@denx.de
parent 2215cb3b

drivers/gpu/drm/panel/panel-sitronix-st7701.c

+1 −1
Original line number Diff line number Diff line
@@ -244,7 +244,7 @@ static void st7701_init_sequence(struct st7701 *st7701) 
		   DSI_CMD2_BK0_INVSEL_ONES_MASK |

		   FIELD_PREP(DSI_CMD2_BK0_INVSEL_NLINV_MASK, desc->nlinv),

		   FIELD_PREP(DSI_CMD2_BK0_INVSEL_RTNI_MASK,

			      DIV_ROUND_UP(mode->htotal, 16)));

			      (clamp((u32)mode->htotal, 512U, 1008U) - 512) / 16));



	/* Command2, BK1 */

	ST7701_DSI(st7701, DSI_CMD2BKX_SEL,