Re: [PATCH 2/2] drm/msm/dpu: Set input_sel bit for INTF

From: Jessica Zhang
Date: Wed Dec 13 2023 - 14:52:19 EST



On 12/2/2023 11:54 AM, Dmitry Baryshkov wrote:
On 01/12/2023 23:29, Abhinav Kumar wrote:


On 11/30/2023 11:36 PM, Dmitry Baryshkov wrote:
On Fri, 1 Dec 2023 at 03:31, Jessica Zhang <quic_jesszhan@xxxxxxxxxxx> wrote:

Set the input_sel bit for encoders as it was missed in the initial
implementation.

Reported-by: Rob Clark <robdclark@xxxxxxxxx>
Fixes: 91143873a05d ("drm/msm/dpu: Add MISR register support for interface")
Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/39
Signed-off-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
---
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c | 2 +-
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.c   | 2 +-
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.c | 7 ++++++-
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.h | 4 +++-
  4 files changed, 11 insertions(+), 4 deletions(-)

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 3442cf65b86f..d0884997ecb7 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
@@ -320,7 +320,7 @@ static u32 dpu_hw_intf_get_line_count(struct dpu_hw_intf *intf)

  static void dpu_hw_intf_setup_misr(struct dpu_hw_intf *intf)
  {
-       dpu_hw_setup_misr(&intf->hw, INTF_MISR_CTRL);
+       dpu_hw_setup_misr(&intf->hw, INTF_MISR_CTRL, true);
  }

  static int dpu_hw_intf_collect_misr(struct dpu_hw_intf *intf, u32 *misr_value)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.c
index f38473e68f79..77b14107c84a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.c
@@ -83,7 +83,7 @@ static void dpu_hw_lm_setup_border_color(struct dpu_hw_mixer *ctx,

  static void dpu_hw_lm_setup_misr(struct dpu_hw_mixer *ctx)
  {
-       dpu_hw_setup_misr(&ctx->hw, LM_MISR_CTRL);
+       dpu_hw_setup_misr(&ctx->hw, LM_MISR_CTRL, false);
  }

  static int dpu_hw_lm_collect_misr(struct dpu_hw_mixer *ctx, u32 *misr_value)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.c
index a8a0a4e76b94..f441df47fdde 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.c
@@ -481,7 +481,8 @@ void _dpu_hw_setup_qos_lut(struct dpu_hw_blk_reg_map *c, u32 offset,
                       cfg->danger_safe_en ? QOS_QOS_CTRL_DANGER_SAFE_EN : 0);
  }

-void dpu_hw_setup_misr(struct dpu_hw_blk_reg_map *c, u32 misr_ctrl_offset)
+void dpu_hw_setup_misr(struct dpu_hw_blk_reg_map *c, u32 misr_ctrl_offset,
+               bool set_input_sel)
  {
         u32 config = 0;

@@ -491,6 +492,10 @@ void dpu_hw_setup_misr(struct dpu_hw_blk_reg_map *c, u32 misr_ctrl_offset)
         wmb();

         config = MISR_FRAME_COUNT | MISR_CTRL_ENABLE | MISR_CTRL_FREE_RUN_MASK;
+
+       if (set_input_sel)
+               config |= MISR_CTRL_INPUT_SEL;
+
         DPU_REG_WRITE(c, misr_ctrl_offset, config);
  }

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.h
index bb496ebe283b..793670d62414 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_util.h
@@ -17,6 +17,7 @@
  #define MISR_CTRL_ENABLE                BIT(8)
  #define MISR_CTRL_STATUS                BIT(9)
  #define MISR_CTRL_STATUS_CLEAR          BIT(10)
+#define MISR_CTRL_INPUT_SEL             BIT(24)

The public apq8916 TRM documents this as a 4-bit field. I think this
was followed into the later generations. Can we please document it
correctly and use an uint instead of just bool for set_input_sel?


Can you pls point us to this document you are referring?

I have this link in my bookmarks, which doesn't seem to work no longer:

https://developer.qualcomm.com/download/sd410/snapdragon-410e-technical-reference-manual.pdf?referrer=node/29241

96boards forum has several links and mentions of this doc.


I was not aware that bit level details are revealed in external documents :)

Even though its a 4-bit field, it only takes a 0 or 1 as others are undefined.

Exposing all the bits will only cause more confusion like it did for others thinking that input select is actually configurable when its not.

I think what we should do is just pass "misr_type" to this API to tell whether its lm misr or intf misr and set BIT(24) based on that.

This would be another simplification. Can we instead just use values 0 and 1 instead and maybe document that by default everybody should use 0.

Hi Dmitry,

Acked. Will change the input_sel parameter to a u8 and add a note that it should be 0x0 by default with an exception for encoders.

Thanks,

Jessica Zhang




  #define MISR_CTRL_FREE_RUN_MASK         BIT(31)

  /*
@@ -357,7 +358,8 @@ void _dpu_hw_setup_qos_lut(struct dpu_hw_blk_reg_map *c, u32 offset,
                            bool qos_8lvl,
                            const struct dpu_hw_qos_cfg *cfg);

-void dpu_hw_setup_misr(struct dpu_hw_blk_reg_map *c, u32 misr_ctrl_offset);
+void dpu_hw_setup_misr(struct dpu_hw_blk_reg_map *c, u32 misr_ctrl_offset,
+                      bool set_input_sel);

  int dpu_hw_collect_misr(struct dpu_hw_blk_reg_map *c,
                 u32 misr_ctrl_offset,

--
2.43.0




--
With best wishes
Dmitry