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drm/panel: sw43408: Separate reset sequence into own function

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Splitting reset() from prepare() follows clean coding practices and lets
us potentially make reset optional in the future for flicker-less
takeover from a bootloader or framebuffer driver where the panel is
already configured.

Signed-off-by: David Heidelberg <david@ixit.cz>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20251214-pixel-3-v7-4-b1c0cf6f224d@ixit.cz
This commit is contained in:
David Heidelberg 2025-12-14 15:51:20 +01:00 committed by Neil Armstrong
parent be85d4124d
commit 5f0cc92fa0
1 changed files with 11 additions and 6 deletions
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17
drivers/gpu/drm/panel/panel-lg-sw43408.c
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@ -119,6 +119,16 @@ static int sw43408_program(struct drm_panel *panel)
return ctx.accum_err;
}
static void sw43408_reset(struct sw43408_panel *ctx)
{
gpiod_set_value(ctx->reset_gpio, 0);
usleep_range(9000, 10000);
gpiod_set_value(ctx->reset_gpio, 1);
usleep_range(1000, 2000);
gpiod_set_value(ctx->reset_gpio, 0);
usleep_range(9000, 10000);
}
static int sw43408_prepare(struct drm_panel *panel)
{
struct sw43408_panel *ctx = to_panel_info(panel);
@ -130,12 +140,7 @@ static int sw43408_prepare(struct drm_panel *panel)
usleep_range(5000, 6000);
gpiod_set_value(ctx->reset_gpio, 0);
usleep_range(9000, 10000);
gpiod_set_value(ctx->reset_gpio, 1);
usleep_range(1000, 2000);
gpiod_set_value(ctx->reset_gpio, 0);
usleep_range(9000, 10000);
sw43408_reset(ctx);
ret = sw43408_program(panel);
if (ret)