1. Patchew
  2. linux
  3. [PATCH v3 0/7] MediaTek DRM - DSI driver cleanups
  4. View patch

[PATCH v3 1/7] drm/mediatek: dsi: Use GENMASK() for register mask definitions

AngeloGioacchino Del Regno posted 7 patches 9 months, 2 weeks ago
There is a newer version of this series
[PATCH v3 1/7] drm/mediatek: dsi: Use GENMASK() for register mask definitions
Posted by AngeloGioacchino Del Regno 9 months, 2 weeks ago 
Change magic numerical masks with usage of the GENMASK() macro
to improve readability.

While at it, also fix the DSI_PS_SEL mask to include all bits instead
of just a subset of them.

This commit brings no functional changes.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 45 +++++++++++++++---------------
 1 file changed, 23 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index a2fdfc8ddb15..3b7392c03b4d 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -58,18 +58,18 @@
 
 #define DSI_TXRX_CTRL		0x18
 #define VC_NUM				BIT(1)
-#define LANE_NUM			(0xf << 2)
+#define LANE_NUM			GENMASK(5, 2)
 #define DIS_EOT				BIT(6)
 #define NULL_EN				BIT(7)
 #define TE_FREERUN			BIT(8)
 #define EXT_TE_EN			BIT(9)
 #define EXT_TE_EDGE			BIT(10)
-#define MAX_RTN_SIZE			(0xf << 12)
+#define MAX_RTN_SIZE			GENMASK(15, 12)
 #define HSTX_CKLP_EN			BIT(16)
 
 #define DSI_PSCTRL		0x1c
-#define DSI_PS_WC			0x3fff
-#define DSI_PS_SEL			(3 << 16)
+#define DSI_PS_WC			GENMASK(14, 0)
+#define DSI_PS_SEL			GENMASK(19, 16)
 #define PACKED_PS_16BIT_RGB565		(0 << 16)
 #define LOOSELY_PS_18BIT_RGB666		(1 << 16)
 #define PACKED_PS_18BIT_RGB666		(2 << 16)
@@ -109,26 +109,26 @@
 #define LD0_WAKEUP_EN			BIT(2)
 
 #define DSI_PHY_TIMECON0	0x110
-#define LPX				(0xff << 0)
-#define HS_PREP				(0xff << 8)
-#define HS_ZERO				(0xff << 16)
-#define HS_TRAIL			(0xff << 24)
+#define LPX				GENMASK(7, 0)
+#define HS_PREP				GENMASK(15, 8)
+#define HS_ZERO				GENMASK(23, 16)
+#define HS_TRAIL			GENMASK(31, 24)
 
 #define DSI_PHY_TIMECON1	0x114
-#define TA_GO				(0xff << 0)
-#define TA_SURE				(0xff << 8)
-#define TA_GET				(0xff << 16)
-#define DA_HS_EXIT			(0xff << 24)
+#define TA_GO				GENMASK(7, 0)
+#define TA_SURE				GENMASK(15, 8)
+#define TA_GET				GENMASK(23, 16)
+#define DA_HS_EXIT			GENMASK(31, 24)
 
 #define DSI_PHY_TIMECON2	0x118
-#define CONT_DET			(0xff << 0)
-#define CLK_ZERO			(0xff << 16)
-#define CLK_TRAIL			(0xff << 24)
+#define CONT_DET			GENMASK(7, 0)
+#define CLK_ZERO			GENMASK(23, 16)
+#define CLK_TRAIL			GENMASK(31, 24)
 
 #define DSI_PHY_TIMECON3	0x11c
-#define CLK_HS_PREP			(0xff << 0)
-#define CLK_HS_POST			(0xff << 8)
-#define CLK_HS_EXIT			(0xff << 16)
+#define CLK_HS_PREP			GENMASK(7, 0)
+#define CLK_HS_POST			GENMASK(15, 8)
+#define CLK_HS_EXIT			GENMASK(23, 16)
 
 #define DSI_VM_CMD_CON		0x130
 #define VM_CMD_EN			BIT(0)
@@ -138,13 +138,14 @@
 #define FORCE_COMMIT			BIT(0)
 #define BYPASS_SHADOW			BIT(1)
 
-#define CONFIG				(0xff << 0)
+/* CMDQ related bits */
+#define CONFIG				GENMASK(7, 0)
 #define SHORT_PACKET			0
 #define LONG_PACKET			2
 #define BTA				BIT(2)
-#define DATA_ID				(0xff << 8)
-#define DATA_0				(0xff << 16)
-#define DATA_1				(0xff << 24)
+#define DATA_ID				GENMASK(15, 8)
+#define DATA_0				GENMASK(23, 16)
+#define DATA_1				GENMASK(31, 24)
 
 #define NS_TO_CYCLE(n, c)    ((n) / (c) + (((n) % (c)) ? 1 : 0))
 
-- 
2.43.0
Re: [PATCH v3 1/7] drm/mediatek: dsi: Use GENMASK() for register mask definitions
Posted by CK Hu (胡俊光) 9 months, 1 week ago 
Hi, Angelo:

On Wed, 2024-01-31 at 12:34 +0100, AngeloGioacchino Del Regno wrote:
> Change magic numerical masks with usage of the GENMASK() macro
> to improve readability.
> 
> While at it, also fix the DSI_PS_SEL mask to include all bits instead
> of just a subset of them.
> 
> This commit brings no functional changes.
> 
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@collabora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 45 +++++++++++++++-------------
> --
>  1 file changed, 23 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c
> b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index a2fdfc8ddb15..3b7392c03b4d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -58,18 +58,18 @@
>  
>  #define DSI_TXRX_CTRL		0x18
>  #define VC_NUM				BIT(1)
> -#define LANE_NUM			(0xf << 2)
> +#define LANE_NUM			GENMASK(5, 2)
>  #define DIS_EOT				BIT(6)
>  #define NULL_EN				BIT(7)
>  #define TE_FREERUN			BIT(8)
>  #define EXT_TE_EN			BIT(9)
>  #define EXT_TE_EDGE			BIT(10)
> -#define MAX_RTN_SIZE			(0xf << 12)
> +#define MAX_RTN_SIZE			GENMASK(15, 12)
>  #define HSTX_CKLP_EN			BIT(16)
>  
>  #define DSI_PSCTRL		0x1c
> -#define DSI_PS_WC			0x3fff
> -#define DSI_PS_SEL			(3 << 16)
> +#define DSI_PS_WC			GENMASK(14, 0)
> +#define DSI_PS_SEL			GENMASK(19, 16)

The original definition of DSI_PS_WC/DSI_PS_SEL is correct in MT8173.
So both need two definition and let each SoC select its own definition.

Regards,
CK

>  #define PACKED_PS_16BIT_RGB565		(0 << 16)
>  #define LOOSELY_PS_18BIT_RGB666		(1 << 16)
>  #define PACKED_PS_18BIT_RGB666		(2 << 16)
> @@ -109,26 +109,26 @@
>  #define LD0_WAKEUP_EN			BIT(2)
>  
>  #define DSI_PHY_TIMECON0	0x110
> -#define LPX				(0xff << 0)
> -#define HS_PREP				(0xff << 8)
> -#define HS_ZERO				(0xff << 16)
> -#define HS_TRAIL			(0xff << 24)
> +#define LPX				GENMASK(7, 0)
> +#define HS_PREP				GENMASK(15, 8)
> +#define HS_ZERO				GENMASK(23, 16)
> +#define HS_TRAIL			GENMASK(31, 24)
>  
>  #define DSI_PHY_TIMECON1	0x114
> -#define TA_GO				(0xff << 0)
> -#define TA_SURE				(0xff << 8)
> -#define TA_GET				(0xff << 16)
> -#define DA_HS_EXIT			(0xff << 24)
> +#define TA_GO				GENMASK(7, 0)
> +#define TA_SURE				GENMASK(15, 8)
> +#define TA_GET				GENMASK(23, 16)
> +#define DA_HS_EXIT			GENMASK(31, 24)
>  
>  #define DSI_PHY_TIMECON2	0x118
> -#define CONT_DET			(0xff << 0)
> -#define CLK_ZERO			(0xff << 16)
> -#define CLK_TRAIL			(0xff << 24)
> +#define CONT_DET			GENMASK(7, 0)
> +#define CLK_ZERO			GENMASK(23, 16)
> +#define CLK_TRAIL			GENMASK(31, 24)
>  
>  #define DSI_PHY_TIMECON3	0x11c
> -#define CLK_HS_PREP			(0xff << 0)
> -#define CLK_HS_POST			(0xff << 8)
> -#define CLK_HS_EXIT			(0xff << 16)
> +#define CLK_HS_PREP			GENMASK(7, 0)
> +#define CLK_HS_POST			GENMASK(15, 8)
> +#define CLK_HS_EXIT			GENMASK(23, 16)
>  
>  #define DSI_VM_CMD_CON		0x130
>  #define VM_CMD_EN			BIT(0)
> @@ -138,13 +138,14 @@
>  #define FORCE_COMMIT			BIT(0)
>  #define BYPASS_SHADOW			BIT(1)
>  
> -#define CONFIG				(0xff << 0)
> +/* CMDQ related bits */
> +#define CONFIG				GENMASK(7, 0)
>  #define SHORT_PACKET			0
>  #define LONG_PACKET			2
>  #define BTA				BIT(2)
> -#define DATA_ID				(0xff << 8)
> -#define DATA_0				(0xff << 16)
> -#define DATA_1				(0xff << 24)
> +#define DATA_ID				GENMASK(15, 8)
> +#define DATA_0				GENMASK(23, 16)
> +#define DATA_1				GENMASK(31, 24)
>  
>  #define NS_TO_CYCLE(n, c)    ((n) / (c) + (((n) % (c)) ? 1 : 0))
>
Re: [PATCH v3 1/7] drm/mediatek: dsi: Use GENMASK() for register mask definitions
Posted by AngeloGioacchino Del Regno 9 months, 1 week ago 
Il 06/02/24 09:57, CK Hu (胡俊光) ha scritto:
> Hi, Angelo:
> 
> On Wed, 2024-01-31 at 12:34 +0100, AngeloGioacchino Del Regno wrote:
>> Change magic numerical masks with usage of the GENMASK() macro
>> to improve readability.
>>
>> While at it, also fix the DSI_PS_SEL mask to include all bits instead
>> of just a subset of them.
>>
>> This commit brings no functional changes.
>>
>> Signed-off-by: AngeloGioacchino Del Regno <
>> angelogioacchino.delregno@collabora.com>
>> ---
>>   drivers/gpu/drm/mediatek/mtk_dsi.c | 45 +++++++++++++++-------------
>> --
>>   1 file changed, 23 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c
>> b/drivers/gpu/drm/mediatek/mtk_dsi.c
>> index a2fdfc8ddb15..3b7392c03b4d 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
>> @@ -58,18 +58,18 @@
>>   
>>   #define DSI_TXRX_CTRL		0x18
>>   #define VC_NUM				BIT(1)
>> -#define LANE_NUM			(0xf << 2)
>> +#define LANE_NUM			GENMASK(5, 2)
>>   #define DIS_EOT				BIT(6)
>>   #define NULL_EN				BIT(7)
>>   #define TE_FREERUN			BIT(8)
>>   #define EXT_TE_EN			BIT(9)
>>   #define EXT_TE_EDGE			BIT(10)
>> -#define MAX_RTN_SIZE			(0xf << 12)
>> +#define MAX_RTN_SIZE			GENMASK(15, 12)
>>   #define HSTX_CKLP_EN			BIT(16)
>>   
>>   #define DSI_PSCTRL		0x1c
>> -#define DSI_PS_WC			0x3fff
>> -#define DSI_PS_SEL			(3 << 16)
>> +#define DSI_PS_WC			GENMASK(14, 0)
>> +#define DSI_PS_SEL			GENMASK(19, 16)
> 
> The original definition of DSI_PS_WC/DSI_PS_SEL is correct in MT8173.
> So both need two definition and let each SoC select its own definition.
> 

The additional bits are unused on older SoCs and, if set, will be simply ignored;
if we want to prevent setting bits that don't exist on the old ones, that should
be done as a later commit introducing SoC capabilities for those and when the new
capabilities for the new SoCs are introduced anyway.

As of now, this doesn't break anything.

Regards,
Angelo
Re: [PATCH v3 1/7] drm/mediatek: dsi: Use GENMASK() for register mask definitions
Posted by CK Hu (胡俊光) 9 months, 1 week ago 
Hi, Angelo:

On Tue, 2024-02-06 at 14:27 +0100, AngeloGioacchino Del Regno wrote:
> Il 06/02/24 09:57, CK Hu (胡俊光) ha scritto:
> > Hi, Angelo:
> > 
> > On Wed, 2024-01-31 at 12:34 +0100, AngeloGioacchino Del Regno
> > wrote:
> > > Change magic numerical masks with usage of the GENMASK() macro
> > > to improve readability.
> > > 
> > > While at it, also fix the DSI_PS_SEL mask to include all bits
> > > instead
> > > of just a subset of them.
> > > 
> > > This commit brings no functional changes.
> > > 
> > > Signed-off-by: AngeloGioacchino Del Regno <
> > > angelogioacchino.delregno@collabora.com>
> > > ---
> > >   drivers/gpu/drm/mediatek/mtk_dsi.c | 45 +++++++++++++++------
> > > -------
> > > --
> > >   1 file changed, 23 insertions(+), 22 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > index a2fdfc8ddb15..3b7392c03b4d 100644
> > > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > @@ -58,18 +58,18 @@
> > >   
> > >   #define DSI_TXRX_CTRL		0x18
> > >   #define VC_NUM				BIT(1)
> > > -#define LANE_NUM			(0xf << 2)
> > > +#define LANE_NUM			GENMASK(5, 2)
> > >   #define DIS_EOT				BIT(6)
> > >   #define NULL_EN				BIT(7)
> > >   #define TE_FREERUN			BIT(8)
> > >   #define EXT_TE_EN			BIT(9)
> > >   #define EXT_TE_EDGE			BIT(10)
> > > -#define MAX_RTN_SIZE			(0xf << 12)
> > > +#define MAX_RTN_SIZE			GENMASK(15, 12)
> > >   #define HSTX_CKLP_EN			BIT(16)
> > >   
> > >   #define DSI_PSCTRL		0x1c
> > > -#define DSI_PS_WC			0x3fff
> > > -#define DSI_PS_SEL			(3 << 16)
> > > +#define DSI_PS_WC			GENMASK(14, 0)
> > > +#define DSI_PS_SEL			GENMASK(19, 16)
> > 
> > The original definition of DSI_PS_WC/DSI_PS_SEL is correct in
> > MT8173.
> > So both need two definition and let each SoC select its own
> > definition.
> > 
> 
> The additional bits are unused on older SoCs and, if set, will be
> simply ignored;
> if we want to prevent setting bits that don't exist on the old ones,
> that should
> be done as a later commit introducing SoC capabilities for those and
> when the new
> capabilities for the new SoCs are introduced anyway.
> 
> As of now, this doesn't break anything.

The title of this patch is only to use GENMASK(), but here does more
things. I agree this does not break anything, but I would like to
separate this to an independent patch just for new bits. In your later
patch, DSI_PS_WC is not used any more. So maybe after that patch, you
could define as:

#define DSI_PS_WC_MT8173 GENMASK(13, 0)
#define DSI_PS_WC_MT8xxx GENMASK(14, 0)

DSI_PS_SEL is not used now, so it could also define as:

#define DSI_PS_SEL_MT8137 GENMASK(17, 16)
#define DSI_PS_SEL_MT8xxx GENMASK(19, 16)

And add definition of value 4 ~ 15.

Regards,
CK

> 
> Regards,
> Angelo
> 
>

Patchew 2.1-devel-b67e4c2

© 2016 - 2024 Red Hat, Inc.