From: Andrzej Hajda Date: Fri, 8 Jun 2018 06:04:57 +0000 (+0200) Subject: drm/bridge/sii8620: simplify hardware reset procedure X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2a593f711a1e0019ca5e5ae601f905443d3ea3d9;p=platform%2Fkernel%2Flinux-exynos.git drm/bridge/sii8620: simplify hardware reset procedure There is no need to flip reset pin twice. Also delays can be changed to values present in vendor's code. Signed-off-by: Andrzej Hajda Tested-by: Marek Szyprowski Reviewed-by: Maciej Purski Link: https://patchwork.freedesktop.org/patch/msgid/20180608060457.18357-1-a.hajda@samsung.com Signed-off-by: Marek Szyprowski Change-Id: Ib7710bedc9f5dbdd448262d44f83c2c80c208ac5 --- diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c index dc29237b3486..2884876d46de 100644 --- a/drivers/gpu/drm/bridge/sil-sii8620.c +++ b/drivers/gpu/drm/bridge/sil-sii8620.c @@ -980,8 +980,17 @@ static int sii8620_hw_on(struct sii8620 *ctx) ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies); if (ret) return ret; + usleep_range(10000, 20000); - return clk_prepare_enable(ctx->clk_xtal); + ret = clk_prepare_enable(ctx->clk_xtal); + if (ret) + return ret; + + msleep(100); + gpiod_set_value(ctx->gpio_reset, 0); + msleep(100); + + return 0; } static int sii8620_hw_off(struct sii8620 *ctx) @@ -991,17 +1000,6 @@ static int sii8620_hw_off(struct sii8620 *ctx) return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies); } -static void sii8620_hw_reset(struct sii8620 *ctx) -{ - usleep_range(10000, 20000); - gpiod_set_value(ctx->gpio_reset, 0); - usleep_range(5000, 20000); - gpiod_set_value(ctx->gpio_reset, 1); - usleep_range(10000, 20000); - gpiod_set_value(ctx->gpio_reset, 0); - msleep(300); -} - static void sii8620_cbus_reset(struct sii8620 *ctx) { sii8620_write(ctx, REG_PWD_SRST, BIT_PWD_SRST_CBUS_RST @@ -2121,7 +2119,6 @@ static void sii8620_cable_in(struct sii8620 *ctx) dev_err(dev, "Error powering on, %d.\n", ret); return; } - sii8620_hw_reset(ctx); sii8620_read_buf(ctx, REG_VND_IDL, ver, ARRAY_SIZE(ver)); ret = sii8620_clear_error(ctx);