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

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[ Upstream commit c1cdee9b68 ]

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: de2b491784 ("drm/panel/panel-sitronix-st7701: Infer horizontal pixel count from TFT mode")
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221012221159.88397-1-marex@denx.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marek Vasut 2022-10-13 00:11:59 +02:00 committed by Greg Kroah-Hartman
parent f3ba0b7a47
commit 18f36c3eed
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/panel/panel-sitronix-st7701.c
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@ -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,