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

[Dmitry Baryshkov <dmitry.baryshkov@linaro.org>]

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_parellan@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.

> 
> 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);
>   

-- 
With best wishes
Dmitry