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Message-ID: <CAMeQTsaWVSyA09e8iTannsaRQ0y88=bduUmJ6368vJSYFa46hA@mail.gmail.com>
Date: Tue, 12 Apr 2022 15:47:09 +0200
From: Patrik Jakobsson <patrik.r.jakobsson@...il.com>
To: James Hilliard <james.hilliard1@...il.com>
Cc: dri-devel <dri-devel@...ts.freedesktop.org>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/gma500: add comments to register definitions
On Tue, Apr 12, 2022 at 3:42 AM James Hilliard
<james.hilliard1@...il.com> wrote:
>
> Extracted from various sources such EMGD releases.
>
> Signed-off-by: James Hilliard <james.hilliard1@...il.com>
Hi James,
These registers are documented in the Intel 965/G35 and G45
documentation [1]. I don't see a clear benefit of duplicating the
names of the registers here. Most other drivers don't do this either.
See i915, AMD, etc.
I prefer to keep the names in the documentation and then add specific
notes for those registers that differ from docs or need additional
clarification. The SGX and MSVDX registers are an exception since we
don't have docs for them. Any hints about bits for those are welcome
as long as we can confirm that they actually do what we think they do.
[1] https://01.org/linuxgraphics/documentation
> ---
> drivers/gpu/drm/gma500/psb_intel_reg.h | 212 +++++++++++++------------
> 1 file changed, 107 insertions(+), 105 deletions(-)
>
> diff --git a/drivers/gpu/drm/gma500/psb_intel_reg.h b/drivers/gpu/drm/gma500/psb_intel_reg.h
> index ced7b433befb..a754bece30f5 100644
> --- a/drivers/gpu/drm/gma500/psb_intel_reg.h
> +++ b/drivers/gpu/drm/gma500/psb_intel_reg.h
> @@ -31,7 +31,7 @@
> # define GPIO_DATA_VAL_IN (1 << 12)
> # define GPIO_DATA_PULLUP_DISABLE (1 << 13)
>
> -#define GMBUS0 0x5100 /* clock/port select */
> +#define GMBUS0 0x5100 /* clock/device select register */
> #define GMBUS_RATE_100KHZ (0<<8)
> #define GMBUS_RATE_50KHZ (1<<8)
> #define GMBUS_RATE_400KHZ (2<<8) /* reserved on Pineview */
> @@ -46,7 +46,7 @@
> /* 6 reserved */
> #define GMBUS_PORT_DPD 7 /* HDMID */
> #define GMBUS_NUM_PORTS 8
> -#define GMBUS1 0x5104 /* command/status */
> +#define GMBUS1 0x5104 /* command/status register */
> #define GMBUS_SW_CLR_INT (1<<31)
> #define GMBUS_SW_RDY (1<<30)
> #define GMBUS_ENT (1<<29) /* enable timeout */
> @@ -59,7 +59,7 @@
> #define GMBUS_SLAVE_ADDR_SHIFT 1
> #define GMBUS_SLAVE_READ (1<<0)
> #define GMBUS_SLAVE_WRITE (0<<0)
> -#define GMBUS2 0x5108 /* status */
> +#define GMBUS2 0x5108 /* status register */
> #define GMBUS_INUSE (1<<15)
> #define GMBUS_HW_WAIT_PHASE (1<<14)
> #define GMBUS_STALL_TIMEOUT (1<<13)
> @@ -67,18 +67,18 @@
> #define GMBUS_HW_RDY (1<<11)
> #define GMBUS_SATOER (1<<10)
> #define GMBUS_ACTIVE (1<<9)
> -#define GMBUS3 0x510c /* data buffer bytes 3-0 */
> -#define GMBUS4 0x5110 /* interrupt mask (Pineview+) */
> +#define GMBUS3 0x510c /* data buffer 3-0 register */
> +#define GMBUS4 0x5110 /* REQUEST_INUSE register (Pineview+) */
> #define GMBUS_SLAVE_TIMEOUT_EN (1<<4)
> #define GMBUS_NAK_EN (1<<3)
> #define GMBUS_IDLE_EN (1<<2)
> #define GMBUS_HW_WAIT_EN (1<<1)
> #define GMBUS_HW_RDY_EN (1<<0)
> -#define GMBUS5 0x5120 /* byte index */
> +#define GMBUS5 0x5120 /* 2-byte index register */
> #define GMBUS_2BYTE_INDEX_EN (1<<31)
>
> -#define BLC_PWM_CTL 0x61254
> -#define BLC_PWM_CTL2 0x61250
> +#define BLC_PWM_CTL 0x61254 /* Backlight PWM Control */
> +#define BLC_PWM_CTL2 0x61250 /* Image BLM Histogram Control */
> #define PWM_ENABLE (1 << 31)
> #define PWM_LEGACY_MODE (1 << 30)
> #define PWM_PIPE_B (1 << 29)
> @@ -117,37 +117,38 @@
> #define I855_CLOCK_166_250 (3 << 0)
>
> /* I830 CRTC registers */
> -#define HTOTAL_A 0x60000
> -#define HBLANK_A 0x60004
> -#define HSYNC_A 0x60008
> -#define VTOTAL_A 0x6000c
> -#define VBLANK_A 0x60010
> -#define VSYNC_A 0x60014
> -#define PIPEASRC 0x6001c
> -#define BCLRPAT_A 0x60020
> +#define HTOTAL_A 0x60000 /* Pipe A Horizontal Total Register */
> +#define HBLANK_A 0x60004 /* Pipe A Horizontal Blank Register */
> +#define HSYNC_A 0x60008 /* Pipe A Horizontal Sync Register */
> +#define VTOTAL_A 0x6000c /* Pipe A Vertical Total Register */
> +#define VBLANK_A 0x60010 /* Pipe A Vertical Blank Register */
> +#define VSYNC_A 0x60014 /* Pipe A Vertical Sync Register */
> +#define PIPEASRC 0x6001c /* Pipe A Source Image Size Register */
> +#define BCLRPAT_A 0x60020 /* Pipe A Border Color Pattern Register */
> #define VSYNCSHIFT_A 0x60028
>
> -#define HTOTAL_B 0x61000
> -#define HBLANK_B 0x61004
> -#define HSYNC_B 0x61008
> -#define VTOTAL_B 0x6100c
> -#define VBLANK_B 0x61010
> -#define VSYNC_B 0x61014
> -#define PIPEBSRC 0x6101c
> -#define BCLRPAT_B 0x61020
> +#define HTOTAL_B 0x61000 /* Pipe B Horizontal Total Register */
> +#define HBLANK_B 0x61004 /* Pipe B Horizontal Blank Register */
> +#define HSYNC_B 0x61008 /* Pipe B Horizontal Sync Register */
> +#define VTOTAL_B 0x6100c /* Pipe B Vertical Total Register */
> +#define VBLANK_B 0x61010 /* Pipe B Vertical Blank Register */
> +#define VSYNC_B 0x61014 /* Pipe B Vertical Sync Register */
> +#define PIPEBSRC 0x6101c /* Pipe B Source Image Size Register */
> +#define BCLRPAT_B 0x61020 /* Pipe B Border Color Pattern Register */
> #define VSYNCSHIFT_B 0x61028
>
> -#define HTOTAL_C 0x62000
> -#define HBLANK_C 0x62004
> -#define HSYNC_C 0x62008
> -#define VTOTAL_C 0x6200c
> -#define VBLANK_C 0x62010
> -#define VSYNC_C 0x62014
> -#define PIPECSRC 0x6201c
> -#define BCLRPAT_C 0x62020
> +#define HTOTAL_C 0x62000 /* Pipe C Horizontal Total Register */
> +#define HBLANK_C 0x62004 /* Pipe C Horizontal Blank Register */
> +#define HSYNC_C 0x62008 /* Pipe C Horizontal Sync Register */
> +#define VTOTAL_C 0x6200c /* Pipe C Vertical Total Register */
> +#define VBLANK_C 0x62010 /* Pipe C Vertical Blank Register */
> +#define VSYNC_C 0x62014 /* Pipe C Vertical Sync Register */
> +#define PIPECSRC 0x6201c /* Pipe C Source Image Size Register */
> +#define BCLRPAT_C 0x62020 /* Pipe C Border Color Pattern Register */
> #define VSYNCSHIFT_C 0x62028
>
> -#define PP_STATUS 0x61200
> +/* Panel power sequencing */
> +#define PP_STATUS 0x61200 /* LVDS Panel Power Status Register */
> # define PP_ON (1 << 31)
> /*
> * Indicates that all dependencies of the panel are on:
> @@ -165,7 +166,7 @@
> #define PP_SEQUENCE_STATE_ON_IDLE (1 << 3)
> #define PP_SEQUENCE_STATE_MASK 0x0000000f
>
> -#define PP_CONTROL 0x61204
> +#define PP_CONTROL 0x61204 /* LVDS Panel Power Control Register */
> #define POWER_TARGET_ON (1 << 0)
> #define PANEL_UNLOCK_REGS (0xabcd << 16)
> #define PANEL_UNLOCK_MASK (0xffff << 16)
> @@ -176,9 +177,9 @@
> #define PANEL_POWER_ON (1 << 0)
>
> /* Poulsbo/Oaktrail */
> -#define LVDSPP_ON 0x61208
> +#define LVDSPP_ON 0x61208 /* Panel Power On Sequencing Delays */
> #define LVDSPP_OFF 0x6120c
> -#define PP_CYCLE 0x61210
> +#define PP_CYCLE 0x61210 /* Panel Power Cycle Delay and Reference */
>
> /* Cedartrail */
> #define PP_ON_DELAYS 0x61208 /* Cedartrail */
> @@ -202,7 +203,8 @@
> #define PANEL_POWER_CYCLE_DELAY_MASK (0x1f)
> #define PANEL_POWER_CYCLE_DELAY_SHIFT 0
>
> -#define PFIT_CONTROL 0x61230
> +/* Panel fitting */
> +#define PFIT_CONTROL 0x61230 /* Panel Fitting Control */
> #define PFIT_ENABLE (1 << 31)
> #define PFIT_PIPE_MASK (3 << 29)
> #define PFIT_PIPE_SHIFT 29
> @@ -218,14 +220,14 @@
> #define HORIZ_AUTO_SCALE (1 << 5)
> #define PANEL_8TO6_DITHER_ENABLE (1 << 3)
>
> -#define PFIT_PGM_RATIOS 0x61234
> +#define PFIT_PGM_RATIOS 0x61234 /* Programmed Panel Fitting Ratios */
> #define PFIT_VERT_SCALE_MASK 0xfff00000
> #define PFIT_HORIZ_SCALE_MASK 0x0000fff0
>
> #define PFIT_AUTO_RATIOS 0x61238
>
> -#define DPLL_A 0x06014
> -#define DPLL_B 0x06018
> +#define DPLL_A 0x06014 /* Display PLL A Control */
> +#define DPLL_B 0x06018 /* Display PLL B Control */
> #define DPLL_VCO_ENABLE (1 << 31)
> #define DPLL_DVO_HIGH_SPEED (1 << 30)
> #define DPLL_SYNCLOCK_ENABLE (1 << 29)
> @@ -336,7 +338,7 @@
> #define DPLLA_TEST_M_BYPASS (1 << 2)
> #define DPLLA_INPUT_BUFFER_ENABLE (1 << 0)
>
> -#define ADPA 0x61100
> +#define ADPA 0x61100 /* Analog Display Port A Control */
> #define ADPA_DAC_ENABLE (1 << 31)
> #define ADPA_DAC_DISABLE 0
> #define ADPA_PIPE_SELECT_MASK (1 << 30)
> @@ -353,10 +355,10 @@
> #define ADPA_HSYNC_ACTIVE_HIGH (1 << 3)
> #define ADPA_HSYNC_ACTIVE_LOW 0
>
> -#define FPA0 0x06040
> -#define FPA1 0x06044
> -#define FPB0 0x06048
> -#define FPB1 0x0604c
> +#define FPA0 0x06040 /* DPLL A Divisor 0 */
> +#define FPA1 0x06044 /* DPLL A Divisor 1 */
> +#define FPB0 0x06048 /* DPLL B Divisor 0 */
> +#define FPB1 0x0604c /* DPLL B Divisor 1 */
> #define FP_N_DIV_MASK 0x003f0000
> #define FP_N_DIV_SHIFT 16
> #define FP_M1_DIV_MASK 0x00003f00
> @@ -476,7 +478,7 @@
> #define LVDS_B0B3_POWER_DOWN (0 << 2)
> #define LVDS_B0B3_POWER_UP (3 << 2)
>
> -#define PIPEACONF 0x70008
> +#define PIPEACONF 0x70008 /* Pipe A Pixel Pipeline Config Reg */
> #define PIPEACONF_ENABLE (1 << 31)
> #define PIPEACONF_DISABLE 0
> #define PIPEACONF_DOUBLE_WIDE (1 << 30)
> @@ -495,7 +497,7 @@
> #define PIPECONF_PLANE_OFF (1 << 19)
> #define PIPECONF_CURSOR_OFF (1 << 18)
>
> -#define PIPEBCONF 0x71008
> +#define PIPEBCONF 0x71008 /* Pipe B Pixel Pipeline Config Reg */
> #define PIPEBCONF_ENABLE (1 << 31)
> #define PIPEBCONF_DISABLE 0
> #define PIPEBCONF_DOUBLE_WIDE (1 << 30)
> @@ -503,15 +505,15 @@
> #define PIPEBCONF_GAMMA (1 << 24)
> #define PIPEBCONF_PALETTE 0
>
> -#define PIPECCONF 0x72008
> +#define PIPECCONF 0x72008 /* Pipe C Pixel Pipeline Config Reg */
>
> -#define PIPEBGCMAXRED 0x71010
> -#define PIPEBGCMAXGREEN 0x71014
> -#define PIPEBGCMAXBLUE 0x71018
> +#define PIPEBGCMAXRED 0x71010 /* Pipe B Gamma Correct. Max Red */
> +#define PIPEBGCMAXGREEN 0x71014 /* Pipe B Gamma Correct. Max Green */
> +#define PIPEBGCMAXBLUE 0x71018 /* Pipe B Gamma Correct. Max Blue */
>
> -#define PIPEASTAT 0x70024
> -#define PIPEBSTAT 0x71024
> -#define PIPECSTAT 0x72024
> +#define PIPEASTAT 0x70024 /* Pipe A Display Status */
> +#define PIPEBSTAT 0x71024 /* Pipe B Display Status */
> +#define PIPECSTAT 0x72024 /* Pipe C Display Status */
> #define PIPE_VBLANK_INTERRUPT_STATUS (1UL << 1)
> #define PIPE_START_VBLANK_INTERRUPT_STATUS (1UL << 2)
> #define PIPE_VBLANK_CLEAR (1 << 1)
> @@ -537,8 +539,8 @@
> #define PIPE_VBLANK_MASK ((1 << 25)|(1 << 24)|(1 << 18)|(1 << 17))
> #define HISTOGRAM_INT_CONTROL 0x61268
> #define HISTOGRAM_BIN_DATA 0X61264
> -#define HISTOGRAM_LOGIC_CONTROL 0x61260
> -#define PWM_CONTROL_LOGIC 0x61250
> +#define HISTOGRAM_LOGIC_CONTROL 0x61260 /* Image BLM Histogram Control */
> +#define PWM_CONTROL_LOGIC 0x61250 /* Backlight PWM Control 2 */
> #define PIPE_HOTPLUG_INTERRUPT_STATUS (1UL << 10)
> #define HISTOGRAM_INTERRUPT_ENABLE (1UL << 31)
> #define HISTOGRAM_LOGIC_ENABLE (1UL << 31)
> @@ -550,12 +552,12 @@
> #define HISTOGRAM_INT_CTRL_CLEAR (1UL << 30)
> #define DPST_YUV_LUMA_MODE 0
>
> -#define PIPEAFRAMEHIGH 0x70040
> -#define PIPEAFRAMEPIXEL 0x70044
> -#define PIPEBFRAMEHIGH 0x71040
> -#define PIPEBFRAMEPIXEL 0x71044
> -#define PIPECFRAMEHIGH 0x72040
> -#define PIPECFRAMEPIXEL 0x72044
> +#define PIPEAFRAMEHIGH 0x70040 /* Pipe A Frame Count High */
> +#define PIPEAFRAMEPIXEL 0x70044 /* Pipe A Frame Cnt Low and pixel cnt */
> +#define PIPEBFRAMEHIGH 0x71040 /* Pipe B Frame Count High */
> +#define PIPEBFRAMEPIXEL 0x71044 /* Pipe B Frame Cnt Low and pixel cnt */
> +#define PIPECFRAMEHIGH 0x72040 /* Pipe C Frame Count High */
> +#define PIPECFRAMEPIXEL 0x72044 /* Pipe C Frame Cnt Low and pixel cnt */
> #define PIPE_FRAME_HIGH_MASK 0x0000ffff
> #define PIPE_FRAME_HIGH_SHIFT 0
> #define PIPE_FRAME_LOW_MASK 0xff000000
> @@ -566,7 +568,7 @@
> #define FW_BLC_SELF 0x20e0
> #define FW_BLC_SELF_EN (1<<15)
>
> -#define DSPARB 0x70030
> +#define DSPARB 0x70030 /* Display Arbitration Control */
> #define DSPFW1 0x70034
> #define DSP_FIFO_SR_WM_MASK 0xFF800000
> #define DSP_FIFO_SR_WM_SHIFT 23
> @@ -585,10 +587,10 @@
> #define CURSOR_B_FIFO_WM1_SHIFT 8
> #define CURSOR_FIFO_SR_WM1_SHIFT 0
> #define DSPFW6 0x70058
> -#define DSPCHICKENBIT 0x70400
> -#define DSPACNTR 0x70180
> -#define DSPBCNTR 0x71180
> -#define DSPCCNTR 0x72180
> +#define DSPCHICKENBIT 0x70400 /* Chicken Bit */
> +#define DSPACNTR 0x70180 /* Display Plane A */
> +#define DSPBCNTR 0x71180 /* Display Plane B */
> +#define DSPCCNTR 0x72180 /* Display Plane C */
> #define DISPLAY_PLANE_ENABLE (1 << 31)
> #define DISPLAY_PLANE_DISABLE 0
> #define DISPPLANE_GAMMA_ENABLE (1 << 30)
> @@ -618,42 +620,42 @@
> #define DISPPLANE_SPRITE_ABOVE_OVERLAY (1)
> #define DISPPLANE_BOTTOM (4)
>
> -#define DSPABASE 0x70184
> +#define DSPABASE 0x70184 /* Display A Start Address */
> #define DSPALINOFF 0x70184
> -#define DSPASTRIDE 0x70188
> +#define DSPASTRIDE 0x70188 /* Display A Stride */
>
> -#define DSPBBASE 0x71184
> +#define DSPBBASE 0x71184 /* Display B Start Address */
> #define DSPBLINOFF 0X71184
> #define DSPBADDR DSPBBASE
> -#define DSPBSTRIDE 0x71188
> +#define DSPBSTRIDE 0x71188 /* Display B Stride */
>
> -#define DSPCBASE 0x72184
> +#define DSPCBASE 0x72184 /* Display C Start Address */
> #define DSPCLINOFF 0x72184
> -#define DSPCSTRIDE 0x72188
> +#define DSPCSTRIDE 0x72188 /* Display C Stride */
>
> -#define DSPAKEYVAL 0x70194
> -#define DSPAKEYMASK 0x70198
> +#define DSPAKEYVAL 0x70194 /* Sprite color key value */
> +#define DSPAKEYMASK 0x70198 /* Sprite color key mask */
>
> -#define DSPAPOS 0x7018C /* reserved */
> -#define DSPASIZE 0x70190
> -#define DSPBPOS 0x7118C
> -#define DSPBSIZE 0x71190
> -#define DSPCPOS 0x7218C
> -#define DSPCSIZE 0x72190
> +#define DSPAPOS 0x7018C /* Display A Position */
> +#define DSPASIZE 0x70190 /* Display A Size */
> +#define DSPBPOS 0x7118C /* Display B Position */
> +#define DSPBSIZE 0x71190 /* Display B Size */
> +#define DSPCPOS 0x7218C /* Display C Position */
> +#define DSPCSIZE 0x72190 /* Display C Size */
>
> -#define DSPASURF 0x7019C
> -#define DSPATILEOFF 0x701A4
> +#define DSPASURF 0x7019C /* Display A Suface base address */
> +#define DSPATILEOFF 0x701A4 /* Display A Tiled Offset */
>
> -#define DSPBSURF 0x7119C
> -#define DSPBTILEOFF 0x711A4
> +#define DSPBSURF 0x7119C /* Display B Suface base address */
> +#define DSPBTILEOFF 0x711A4 /* Display B Tiled Offset */
>
> -#define DSPCSURF 0x7219C
> -#define DSPCTILEOFF 0x721A4
> -#define DSPCKEYMAXVAL 0x721A0
> -#define DSPCKEYMINVAL 0x72194
> -#define DSPCKEYMSK 0x72198
> +#define DSPCSURF 0x7219C /* Display C Suface base address */
> +#define DSPCTILEOFF 0x721A4 /* Display C Tiled Offset */
> +#define DSPCKEYMAXVAL 0x721A0 /* Display C Sprint color key Max */
> +#define DSPCKEYMINVAL 0x72194 /* Sprite color key Min */
> +#define DSPCKEYMSK 0x72198 /* Sprite color key mask */
>
> -#define VGACNTRL 0x71400
> +#define VGACNTRL 0x71400 /* VGA Display Plane Control Register */
> #define VGA_DISP_DISABLE (1 << 31)
> #define VGA_2X_MODE (1 << 30)
> #define VGA_PIPE_B_SELECT (1 << 29)
> @@ -662,7 +664,7 @@
> * Overlay registers
> */
> #define OV_C_OFFSET 0x08000
> -#define OV_OVADD 0x30000
> +#define OV_OVADD 0x30000 /* Overlay Control */
> #define OV_DOVASTA 0x30008
> # define OV_PIPE_SELECT ((1 << 6)|(1 << 7))
> # define OV_PIPE_SELECT_POS 6
> @@ -687,7 +689,7 @@
> * Some BIOS scratch area registers. The 845 (and 830?) store the amount
> * of video memory available to the BIOS in SWF1.
> */
> -#define SWF0 0x71410
> +#define SWF0 0x71410 /* Software flags B Base Addr */
> #define SWF1 0x71414
> #define SWF2 0x71418
> #define SWF3 0x7141c
> @@ -698,7 +700,7 @@
> /*
> * 855 scratch registers.
> */
> -#define SWF00 0x70410
> +#define SWF00 0x70410 /* Software flags A Base Addr */
> #define SWF01 0x70414
> #define SWF02 0x70418
> #define SWF03 0x7041c
> @@ -748,18 +750,18 @@
> /*
> * Interrupt Registers
> */
> -#define IER 0x020a0
> -#define IIR 0x020a4
> -#define IMR 0x020a8
> -#define ISR 0x020ac
> +#define IER 0x020a0 /* Interrupt Enable */
> +#define IIR 0x020a4 /* Interrupt Identity */
> +#define IMR 0x020a8 /* Interrupt Mask */
> +#define ISR 0x020ac /* Interrupt Status */
>
> /*
> * MOORESTOWN delta registers
> */
> -#define MRST_DPLL_A 0x0f014
> +#define MRST_DPLL_A 0x0f014 /* Display PLL A Control */
> #define DPLLA_MODE_LVDS (2 << 26) /* mrst */
> -#define MRST_FPA0 0x0f040
> -#define MRST_FPA1 0x0f044
> +#define MRST_FPA0 0x0f040 /* DPLL A Divisor 0 */
> +#define MRST_FPA1 0x0f044 /* DPLL A Divisor 1 */
> #define MRST_PERF_MODE 0x020f4
>
> /*
> @@ -806,8 +808,8 @@
> #define PIPEACONF_PIPE_STATE (1 << 30)
> /* #define DSPACNTR 0x70180 */
>
> -#define MRST_DSPABASE 0x7019c
> -#define MRST_DSPBBASE 0x7119c
> +#define MRST_DSPABASE 0x7019c /* Display A Suface base address */
> +#define MRST_DSPBBASE 0x7119c /* Display B Suface base address */
>
> /*
> * Moorestown registers.
> @@ -1396,14 +1398,14 @@ No status bits are changed.
> * is 20 bytes in each direction, hence the 5 fixed
> * data registers
> */
> -#define DPB_AUX_CH_CTL 0x64110
> +#define DPB_AUX_CH_CTL 0x64110 /* Display Port B AUX Channel Control */
> #define DPB_AUX_CH_DATA1 0x64114
> #define DPB_AUX_CH_DATA2 0x64118
> #define DPB_AUX_CH_DATA3 0x6411c
> #define DPB_AUX_CH_DATA4 0x64120
> #define DPB_AUX_CH_DATA5 0x64124
>
> -#define DPC_AUX_CH_CTL 0x64210
> +#define DPC_AUX_CH_CTL 0x64210 /* Display Port C AUX Channel Control */
> #define DPC_AUX_CH_DATA1 0x64214
> #define DPC_AUX_CH_DATA2 0x64218
> #define DPC_AUX_CH_DATA3 0x6421c
> --
> 2.25.1
>
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