Re: [PATCH 09/17] drm/msm/dp: move parity calculation to dp_catalog

Sat, 27 Jan 2024 21:19:01 -0800 


On 1/25/2024 1:32 PM, Dmitry Baryshkov wrote:

On 25/01/2024 21:38, Paloma Arellano wrote:

Parity calculation is necessary for VSC SDP implementation, therefore
move it to dp_catalog so it usable by both SDP programming and
dp_audio.c

Signed-off-by: Paloma Arellano <quic_parel...@quicinc.com>
---
  drivers/gpu/drm/msm/dp/dp_audio.c   | 100 ++++------------------------
  drivers/gpu/drm/msm/dp/dp_catalog.h |  72 ++++++++++++++++++++
  2 files changed, 86 insertions(+), 86 deletions(-)



There is nothing catalog-uish in the parity calculation. Just add 
dp_utils.c. Another options is to push it to the drm/display/


LGTM otherwise.

Ack. Will move to dp_utils.c





diff --git a/drivers/gpu/drm/msm/dp/dp_audio.c 
b/drivers/gpu/drm/msm/dp/dp_audio.c

index 4a2e479723a85..7aa785018155a 100644
--- a/drivers/gpu/drm/msm/dp/dp_audio.c
+++ b/drivers/gpu/drm/msm/dp/dp_audio.c
@@ -16,13 +16,6 @@
  #include "dp_panel.h"
  #include "dp_display.h"
  -#define HEADER_BYTE_2_BIT     0
-#define PARITY_BYTE_2_BIT     8
-#define HEADER_BYTE_1_BIT    16
-#define PARITY_BYTE_1_BIT    24
-#define HEADER_BYTE_3_BIT    16
-#define PARITY_BYTE_3_BIT    24
-
  struct dp_audio_private {
      struct platform_device *audio_pdev;
      struct platform_device *pdev;
@@ -36,71 +29,6 @@ struct dp_audio_private {
      struct dp_audio dp_audio;
  };
  -static u8 dp_audio_get_g0_value(u8 data)
-{
-    u8 c[4];
-    u8 g[4];
-    u8 ret_data = 0;
-    u8 i;
-
-    for (i = 0; i < 4; i++)
-        c[i] = (data >> i) & 0x01;
-
-    g[0] = c[3];
-    g[1] = c[0] ^ c[3];
-    g[2] = c[1];
-    g[3] = c[2];
-
-    for (i = 0; i < 4; i++)
-        ret_data = ((g[i] & 0x01) << i) | ret_data;
-
-    return ret_data;
-}
-
-static u8 dp_audio_get_g1_value(u8 data)
-{
-    u8 c[4];
-    u8 g[4];
-    u8 ret_data = 0;
-    u8 i;
-
-    for (i = 0; i < 4; i++)
-        c[i] = (data >> i) & 0x01;
-
-    g[0] = c[0] ^ c[3];
-    g[1] = c[0] ^ c[1] ^ c[3];
-    g[2] = c[1] ^ c[2];
-    g[3] = c[2] ^ c[3];
-
-    for (i = 0; i < 4; i++)
-        ret_data = ((g[i] & 0x01) << i) | ret_data;
-
-    return ret_data;
-}
-
-static u8 dp_audio_calculate_parity(u32 data)
-{
-    u8 x0 = 0;
-    u8 x1 = 0;
-    u8 ci = 0;
-    u8 iData = 0;
-    u8 i = 0;
-    u8 parity_byte;
-    u8 num_byte = (data & 0xFF00) > 0 ? 8 : 2;
-
-    for (i = 0; i < num_byte; i++) {
-        iData = (data >> i*4) & 0xF;
-
-        ci = iData ^ x1;
-        x1 = x0 ^ dp_audio_get_g1_value(ci);
-        x0 = dp_audio_get_g0_value(ci);
-    }
-
-    parity_byte = x1 | (x0 << 4);
-
-    return parity_byte;
-}
-
  static u32 dp_audio_get_header(struct dp_catalog *catalog,
          enum dp_catalog_audio_sdp_type sdp,
          enum dp_catalog_audio_header_type header)

@@ -134,7 +62,7 @@ static void dp_audio_stream_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_1);
        new_value = 0x02;
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_1_BIT)
              | (parity_byte << PARITY_BYTE_1_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -147,7 +75,7 @@ static void dp_audio_stream_sdp(struct 
dp_audio_private *audio)

      value = dp_audio_get_header(catalog,
              DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_2);
      new_value = value;
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_2_BIT)
              | (parity_byte << PARITY_BYTE_2_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -162,7 +90,7 @@ static void dp_audio_stream_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_STREAM, DP_AUDIO_SDP_HEADER_3);
        new_value = audio->channels - 1;
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_3_BIT)
              | (parity_byte << PARITY_BYTE_3_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -184,7 +112,7 @@ static void dp_audio_timestamp_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_1);
        new_value = 0x1;
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_1_BIT)
              | (parity_byte << PARITY_BYTE_1_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -198,7 +126,7 @@ static void dp_audio_timestamp_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_2);
        new_value = 0x17;
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_2_BIT)
              | (parity_byte << PARITY_BYTE_2_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -212,7 +140,7 @@ static void dp_audio_timestamp_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_TIMESTAMP, DP_AUDIO_SDP_HEADER_3);
        new_value = (0x0 | (0x11 << 2));
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_3_BIT)
              | (parity_byte << PARITY_BYTE_3_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -233,7 +161,7 @@ static void dp_audio_infoframe_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_1);
        new_value = 0x84;
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_1_BIT)
              | (parity_byte << PARITY_BYTE_1_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -247,7 +175,7 @@ static void dp_audio_infoframe_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_2);
        new_value = 0x1b;
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_2_BIT)
              | (parity_byte << PARITY_BYTE_2_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -261,7 +189,7 @@ static void dp_audio_infoframe_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_INFOFRAME, DP_AUDIO_SDP_HEADER_3);
        new_value = (0x0 | (0x11 << 2));
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_3_BIT)
              | (parity_byte << PARITY_BYTE_3_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -282,7 +210,7 @@ static void dp_audio_copy_management_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_1);
        new_value = 0x05;
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_1_BIT)
              | (parity_byte << PARITY_BYTE_1_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -296,7 +224,7 @@ static void dp_audio_copy_management_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_2);
        new_value = 0x0F;
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_2_BIT)
              | (parity_byte << PARITY_BYTE_2_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -310,7 +238,7 @@ static void dp_audio_copy_management_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_COPYMANAGEMENT, DP_AUDIO_SDP_HEADER_3);
        new_value = 0x0;
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_3_BIT)
              | (parity_byte << PARITY_BYTE_3_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -331,7 +259,7 @@ static void dp_audio_isrc_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_ISRC, DP_AUDIO_SDP_HEADER_1);
        new_value = 0x06;
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_1_BIT)
              | (parity_byte << PARITY_BYTE_1_BIT));
      drm_dbg_dp(audio->drm_dev,

@@ -345,7 +273,7 @@ static void dp_audio_isrc_sdp(struct 
dp_audio_private *audio)

              DP_AUDIO_SDP_ISRC, DP_AUDIO_SDP_HEADER_2);
        new_value = 0x0F;
-    parity_byte = dp_audio_calculate_parity(new_value);
+    parity_byte = dp_catalog_calculate_parity(new_value);
      value |= ((new_value << HEADER_BYTE_2_BIT)
              | (parity_byte << PARITY_BYTE_2_BIT));
      drm_dbg_dp(audio->drm_dev,

diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h 
b/drivers/gpu/drm/msm/dp/dp_catalog.h

index 6cb5e2a243de2..563903605b3a7 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.h
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
@@ -45,6 +45,13 @@ enum dp_phy_aux_config_type {
      PHY_AUX_CFG_MAX,
  };
  +#define HEADER_BYTE_2_BIT     0
+#define PARITY_BYTE_2_BIT     8
+#define HEADER_BYTE_1_BIT    16
+#define PARITY_BYTE_1_BIT    24
+#define HEADER_BYTE_3_BIT    16
+#define PARITY_BYTE_3_BIT    24
+
  enum dp_catalog_audio_sdp_type {
      DP_AUDIO_SDP_STREAM,
      DP_AUDIO_SDP_TIMESTAMP,
@@ -73,6 +80,71 @@ struct dp_catalog {
      bool wide_bus_en;
  };
  +static inline u8 dp_catalog_get_g0_value(u8 data)
+{
+    u8 c[4];
+    u8 g[4];
+    u8 ret_data = 0;
+    u8 i;
+
+    for (i = 0; i < 4; i++)
+        c[i] = (data >> i) & 0x01;
+
+    g[0] = c[3];
+    g[1] = c[0] ^ c[3];
+    g[2] = c[1];
+    g[3] = c[2];
+
+    for (i = 0; i < 4; i++)
+        ret_data = ((g[i] & 0x01) << i) | ret_data;
+
+    return ret_data;
+}
+
+static inline u8 dp_catalog_get_g1_value(u8 data)
+{
+    u8 c[4];
+    u8 g[4];
+    u8 ret_data = 0;
+    u8 i;
+
+    for (i = 0; i < 4; i++)
+        c[i] = (data >> i) & 0x01;
+
+    g[0] = c[0] ^ c[3];
+    g[1] = c[0] ^ c[1] ^ c[3];
+    g[2] = c[1] ^ c[2];
+    g[3] = c[2] ^ c[3];
+
+    for (i = 0; i < 4; i++)
+        ret_data = ((g[i] & 0x01) << i) | ret_data;
+
+    return ret_data;
+}
+
+static inline u8 dp_catalog_calculate_parity(u32 data)
+{
+    u8 x0 = 0;
+    u8 x1 = 0;
+    u8 ci = 0;
+    u8 iData = 0;
+    u8 i = 0;
+    u8 parity_byte;
+    u8 num_byte = (data & 0xFF00) > 0 ? 8 : 2;
+
+    for (i = 0; i < num_byte; i++) {
+        iData = (data >> i * 4) & 0xF;
+
+        ci = iData ^ x1;
+        x1 = x0 ^ dp_catalog_get_g1_value(ci);
+        x0 = dp_catalog_get_g0_value(ci);
+    }
+
+    parity_byte = x1 | (x0 << 4);
+
+    return parity_byte;
+}
+
  /* Debug module */

  void dp_catalog_snapshot(struct dp_catalog *dp_catalog, struct 
msm_disp_state *disp_state);

























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