diff mbox series

[1/4] drm/msm/dpu: Introduce knowledge of widebus feature

Message ID 20210511041852.592295-2-bjorn.andersson@linaro.org (mailing list archive)
State New, archived
Headers show
Series drm/msm/dpu: Qualcomm SC8180x MDSS/DPU support | expand

Commit Message

Bjorn Andersson May 11, 2021, 4:18 a.m. UTC 
Some hardware supports clocking 2 pixels per pixel clock pulse, known as
"widebus". The configuration needs to match between the DPU and the
interface controller, and the timing parameters must be adjusted.

As a first step towards supporting this, start by adding a INTF mask
flag to signal the timing configuration code that the INTF_CONFIG2
register should be written - which will clear the bit, in the case that
the bootloader left it set.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 2 ++
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c    | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

Comments

Dmitry Baryshkov May 12, 2021, 11:14 p.m. UTC | #1 
On Tue, 11 May 2021 at 07:18, Bjorn Andersson
<bjorn.andersson@linaro.org> wrote:
>
> Some hardware supports clocking 2 pixels per pixel clock pulse, known as
> "widebus". The configuration needs to match between the DPU and the
> interface controller, and the timing parameters must be adjusted.
>
> As a first step towards supporting this, start by adding a INTF mask
> flag to signal the timing configuration code that the INTF_CONFIG2
> register should be written - which will clear the bit, in the case that
> the bootloader left it set.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 2 ++
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c    | 3 ++-
>  2 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> index 4dfd8a20ad5c..c2f34a4f82d9 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> @@ -196,12 +196,14 @@ enum {
>   * @DPU_INTF_TE                 INTF block has TE configuration support
>   * @DPU_DATA_HCTL_EN            Allows data to be transferred at different rate
>                                  than video timing
> + * @DPU_INTF_WIDEBUS            INTF block supports driving 2 pixels per clock
>   * @DPU_INTF_MAX
>   */
>  enum {
>         DPU_INTF_INPUT_CTRL = 0x1,
>         DPU_INTF_TE,
>         DPU_DATA_HCTL_EN,
> +       DPU_INTF_WIDEBUS,
>         DPU_INTF_MAX
>  };
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> index 1599e3f49a4f..933485d8c03c 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> @@ -183,7 +183,6 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>         if (ctx->cap->features & BIT(DPU_DATA_HCTL_EN)) {
>                 intf_cfg2 |= BIT(4);
>                 display_data_hctl = display_hctl;
> -               DPU_REG_WRITE(c, INTF_CONFIG2, intf_cfg2);
>                 DPU_REG_WRITE(c, INTF_DISPLAY_DATA_HCTL, display_data_hctl);
>         }
>
> @@ -204,6 +203,8 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>         DPU_REG_WRITE(c, INTF_FRAME_LINE_COUNT_EN, 0x3);
>         DPU_REG_WRITE(c, INTF_CONFIG, intf_cfg);
>         DPU_REG_WRITE(c, INTF_PANEL_FORMAT, panel_format);
> +       if (ctx->cap->features & (BIT(DPU_DATA_HCTL_EN) | BIT(DPU_INTF_WIDEBUS)))
> +               DPU_REG_WRITE(c, INTF_CONFIG2, intf_cfg2);
>  }
>
>  static void dpu_hw_intf_enable_timing_engine(
> --
> 2.29.2
>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
index 4dfd8a20ad5c..c2f34a4f82d9 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
@@ -196,12 +196,14 @@  enum {
  * @DPU_INTF_TE                 INTF block has TE configuration support
  * @DPU_DATA_HCTL_EN            Allows data to be transferred at different rate
                                 than video timing
+ * @DPU_INTF_WIDEBUS            INTF block supports driving 2 pixels per clock
  * @DPU_INTF_MAX
  */
 enum {
 	DPU_INTF_INPUT_CTRL = 0x1,
 	DPU_INTF_TE,
 	DPU_DATA_HCTL_EN,
+	DPU_INTF_WIDEBUS,
 	DPU_INTF_MAX
 };
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
index 1599e3f49a4f..933485d8c03c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
@@ -183,7 +183,6 @@  static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
 	if (ctx->cap->features & BIT(DPU_DATA_HCTL_EN)) {
 		intf_cfg2 |= BIT(4);
 		display_data_hctl = display_hctl;
-		DPU_REG_WRITE(c, INTF_CONFIG2, intf_cfg2);
 		DPU_REG_WRITE(c, INTF_DISPLAY_DATA_HCTL, display_data_hctl);
 	}
 
@@ -204,6 +203,8 @@  static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
 	DPU_REG_WRITE(c, INTF_FRAME_LINE_COUNT_EN, 0x3);
 	DPU_REG_WRITE(c, INTF_CONFIG, intf_cfg);
 	DPU_REG_WRITE(c, INTF_PANEL_FORMAT, panel_format);
+	if (ctx->cap->features & (BIT(DPU_DATA_HCTL_EN) | BIT(DPU_INTF_WIDEBUS)))
+		DPU_REG_WRITE(c, INTF_CONFIG2, intf_cfg2);
 }
 
 static void dpu_hw_intf_enable_timing_engine(