* [PATCH v1] drm/bridge: lt9611: Fix PLL being unable to lock
@ 2022-12-13 15:03 Robert Foss
2022-12-13 16:46 ` Amit Pundir
2022-12-15 10:26 ` Robert Foss
0 siblings, 2 replies; 3+ messages in thread
From: Robert Foss @ 2022-12-13 15:03 UTC (permalink / raw)
To: andrzej.hajda, neil.armstrong, robert.foss, Laurent.pinchart,
jonas, jernej.skrabec, airlied, daniel, dri-devel, linux-kernel,
Amit Pundir
This fixes PLL being unable to lock, and is derived from an equivalent
downstream commit.
Available LT9611 documentation does not list this register, neither does
LT9611UXC (which is a different chip).
This commit has been confirmed to fix HDMI output on DragonBoard 845c.
Suggested-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
---
drivers/gpu/drm/bridge/lontium-lt9611.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
index ffcdc8dba3798..3ce4e495aee50 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
@@ -259,6 +259,7 @@ static int lt9611_pll_setup(struct lt9611 *lt9611, const struct drm_display_mode
{ 0x8126, 0x55 },
{ 0x8127, 0x66 },
{ 0x8128, 0x88 },
+ { 0x812a, 0x20 },
};
regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v1] drm/bridge: lt9611: Fix PLL being unable to lock
2022-12-13 15:03 [PATCH v1] drm/bridge: lt9611: Fix PLL being unable to lock Robert Foss
@ 2022-12-13 16:46 ` Amit Pundir
2022-12-15 10:26 ` Robert Foss
1 sibling, 0 replies; 3+ messages in thread
From: Amit Pundir @ 2022-12-13 16:46 UTC (permalink / raw)
To: Robert Foss
Cc: stable, andrzej.hajda, neil.armstrong, Laurent.pinchart, jonas,
jernej.skrabec, airlied, daniel, dri-devel, linux-kernel
On Tue, 13 Dec 2022 at 20:33, Robert Foss <robert.foss@linaro.org> wrote:
>
> This fixes PLL being unable to lock, and is derived from an equivalent
> downstream commit.
>
> Available LT9611 documentation does not list this register, neither does
> LT9611UXC (which is a different chip).
>
> This commit has been confirmed to fix HDMI output on DragonBoard 845c.
>
Cc: <stable@vger.kernel.org> [v5.10+]
Reviewed-by: Amit Pundir <amit.pundir@linaro.org>
> Suggested-by: Amit Pundir <amit.pundir@linaro.org>
> Signed-off-by: Robert Foss <robert.foss@linaro.org>
> ---
> drivers/gpu/drm/bridge/lontium-lt9611.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
> index ffcdc8dba3798..3ce4e495aee50 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt9611.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
> @@ -259,6 +259,7 @@ static int lt9611_pll_setup(struct lt9611 *lt9611, const struct drm_display_mode
> { 0x8126, 0x55 },
> { 0x8127, 0x66 },
> { 0x8128, 0x88 },
> + { 0x812a, 0x20 },
> };
>
> regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
> --
> 2.34.1
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v1] drm/bridge: lt9611: Fix PLL being unable to lock
2022-12-13 15:03 [PATCH v1] drm/bridge: lt9611: Fix PLL being unable to lock Robert Foss
2022-12-13 16:46 ` Amit Pundir
@ 2022-12-15 10:26 ` Robert Foss
1 sibling, 0 replies; 3+ messages in thread
From: Robert Foss @ 2022-12-15 10:26 UTC (permalink / raw)
To: neil.armstrong, dri-devel, andrzej.hajda, jonas, linux-kernel,
Laurent.pinchart, airlied, Robert Foss, daniel, jernej.skrabec,
Amit Pundir
On Tue, 13 Dec 2022 16:03:04 +0100, Robert Foss wrote:
> This fixes PLL being unable to lock, and is derived from an equivalent
> downstream commit.
>
> Available LT9611 documentation does not list this register, neither does
> LT9611UXC (which is a different chip).
>
> This commit has been confirmed to fix HDMI output on DragonBoard 845c.
>
> [...]
Applied, thanks!
Repo: https://cgit.freedesktop.org/drm/drm-misc/
[1/1] drm/bridge: lt9611: Fix PLL being unable to lock
commit: 2a9df204be0bbb896e087f00b9ee3fc559d5a608
rob
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-12-13 16:46 ` Amit Pundir
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