* [PATCH] drm/msm/mdp5: Always generate active-high sync signals for DSI
@ 2015-05-22 14:16 Hai Li
2015-05-25 5:05 ` Archit Taneja
0 siblings, 1 reply; 2+ messages in thread
From: Hai Li @ 2015-05-22 14:16 UTC (permalink / raw)
To: dri-devel; +Cc: linux-arm-msm, linux-kernel, robdclark, Hai Li
DSI video mode engine can only take active-high sync signals. This
change prevents MDP5 sending active-low sync signals to DSI in any
case.
Signed-off-by: Hai Li <hali@codeaurora.org>
---
drivers/gpu/drm/msm/mdp/mdp5/mdp5_encoder.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_encoder.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_encoder.c
index 53bb1f7..2e98ce0 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_encoder.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_encoder.c
@@ -144,10 +144,14 @@ static void mdp5_encoder_mode_set(struct drm_encoder *encoder,
mode->type, mode->flags);
ctrl_pol = 0;
- if (mode->flags & DRM_MODE_FLAG_NHSYNC)
- ctrl_pol |= MDP5_INTF_POLARITY_CTL_HSYNC_LOW;
- if (mode->flags & DRM_MODE_FLAG_NVSYNC)
- ctrl_pol |= MDP5_INTF_POLARITY_CTL_VSYNC_LOW;
+
+ /* DSI controller cannot handle active-low sync signals. */
+ if (mdp5_encoder->intf.type != INTF_DSI) {
+ if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+ ctrl_pol |= MDP5_INTF_POLARITY_CTL_HSYNC_LOW;
+ if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+ ctrl_pol |= MDP5_INTF_POLARITY_CTL_VSYNC_LOW;
+ }
/* probably need to get DATA_EN polarity from panel.. */
dtv_hsync_skew = 0; /* get this from panel? */
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] drm/msm/mdp5: Always generate active-high sync signals for DSI
2015-05-22 14:16 [PATCH] drm/msm/mdp5: Always generate active-high sync signals for DSI Hai Li
@ 2015-05-25 5:05 ` Archit Taneja
0 siblings, 0 replies; 2+ messages in thread
From: Archit Taneja @ 2015-05-25 5:05 UTC (permalink / raw)
To: Hai Li, dri-devel; +Cc: linux-arm-msm, linux-kernel
On 05/22/2015 07:46 PM, Hai Li wrote:
> DSI video mode engine can only take active-high sync signals. This
> change prevents MDP5 sending active-low sync signals to DSI in any
> case.
>
> Signed-off-by: Hai Li <hali@codeaurora.org>
Tested-by: Archit Taneja <architt@codeaurora.org>
> ---
> drivers/gpu/drm/msm/mdp/mdp5/mdp5_encoder.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_encoder.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_encoder.c
> index 53bb1f7..2e98ce0 100644
> --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_encoder.c
> +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_encoder.c
> @@ -144,10 +144,14 @@ static void mdp5_encoder_mode_set(struct drm_encoder *encoder,
> mode->type, mode->flags);
>
> ctrl_pol = 0;
> - if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> - ctrl_pol |= MDP5_INTF_POLARITY_CTL_HSYNC_LOW;
> - if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> - ctrl_pol |= MDP5_INTF_POLARITY_CTL_VSYNC_LOW;
> +
> + /* DSI controller cannot handle active-low sync signals. */
> + if (mdp5_encoder->intf.type != INTF_DSI) {
> + if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> + ctrl_pol |= MDP5_INTF_POLARITY_CTL_HSYNC_LOW;
> + if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> + ctrl_pol |= MDP5_INTF_POLARITY_CTL_VSYNC_LOW;
> + }
> /* probably need to get DATA_EN polarity from panel.. */
>
> dtv_hsync_skew = 0; /* get this from panel? */
>
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
^ permalink raw reply [flat|nested] 2+ messages in thread
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