[PATCH v3 13/19] drm/msm/dp: add VSC SDP support for YUV420 over DP
Abhinav Kumar
quic_abhinavk at quicinc.com
Wed Feb 14 20:15:06 UTC 2024
On 2/14/2024 11:39 AM, Dmitry Baryshkov wrote:
> On Wed, 14 Feb 2024 at 20:04, Paloma Arellano <quic_parellan at quicinc.com> wrote:
>>
>> Add support to pack and send the VSC SDP packet for DP. This therefore
>> allows the transmision of format information to the sinks which is
>> needed for YUV420 support over DP.
>>
>> Changes in v3:
>> - Create a new struct, msm_dp_sdp_with_parity, which holds the
>> packing information for VSC SDP
>> - Use drm_dp_vsc_sdp_pack() to pack the data into the new
>> msm_dp_sdp_with_parity struct instead of specifically packing
>> for YUV420 format
>> - Modify dp_catalog_panel_send_vsc_sdp() to send the VSC SDP
>> data using the new msm_dp_sdp_with_parity struct
>>
>> Changes in v2:
>> - Rename GENERIC0_SDPSIZE macro to GENERIC0_SDPSIZE_VALID
>> - Remove dp_sdp from the dp_catalog struct since this data is
>> being allocated at the point used
>> - Create a new function in dp_utils to pack the VSC SDP data
>> into a buffer
>> - Create a new function that packs the SDP header bytes into a
>> buffer. This function is made generic so that it can be
>> utilized by dp_audio
>> header bytes into a buffer
>> - Create a new function in dp_utils that takes the packed buffer
>> and writes to the DP_GENERIC0_* registers
>> - Split the dp_catalog_panel_config_vsc_sdp() function into two
>> to disable/enable sending VSC SDP packets
>> - Check the DP HW version using the original useage of
>> dp_catalog_hw_revision() and correct the version checking
>> logic
>> - Rename dp_panel_setup_vsc_sdp() to
>> dp_panel_setup_vsc_sdp_yuv_420() to explicitly state that
>> currently VSC SDP is only being set up to support YUV420 modes
>>
>> Signed-off-by: Paloma Arellano <quic_parellan at quicinc.com>
>> ---
>> drivers/gpu/drm/msm/dp/dp_catalog.c | 113 ++++++++++++++++++++++++++++
>> drivers/gpu/drm/msm/dp/dp_catalog.h | 7 ++
>> drivers/gpu/drm/msm/dp/dp_ctrl.c | 4 +
>> drivers/gpu/drm/msm/dp/dp_panel.c | 55 ++++++++++++++
>> drivers/gpu/drm/msm/dp/dp_reg.h | 3 +
>> drivers/gpu/drm/msm/dp/dp_utils.c | 48 ++++++++++++
>> drivers/gpu/drm/msm/dp/dp_utils.h | 18 +++++
>> 7 files changed, 248 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
>> index 5d84c089e520a..61d5317efe683 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_catalog.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
>> @@ -901,6 +901,119 @@ int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog)
>> return 0;
>> }
>>
>> +static void dp_catalog_panel_send_vsc_sdp(struct dp_catalog *dp_catalog,
>> + struct msm_dp_sdp_with_parity *msm_dp_sdp)
>> +{
>> + struct dp_catalog_private *catalog;
>> + u32 val;
>> +
>> + if (!dp_catalog) {
>> + DRM_ERROR("invalid input\n");
>> + return;
>> + }
>> +
>> + catalog = container_of(dp_catalog, struct dp_catalog_private, dp_catalog);
>> +
>> + val = ((msm_dp_sdp->vsc_sdp.sdp_header.HB0) << HEADER_BYTE_0_BIT |
>> + (msm_dp_sdp->pb.PB0 << PARITY_BYTE_0_BIT) |
>> + (msm_dp_sdp->vsc_sdp.sdp_header.HB1) << HEADER_BYTE_1_BIT |
>> + (msm_dp_sdp->pb.PB1 << PARITY_BYTE_1_BIT));
>> + dp_write_link(catalog, MMSS_DP_GENERIC0_0, val);
>> +
>> + val = ((msm_dp_sdp->vsc_sdp.sdp_header.HB2) << HEADER_BYTE_2_BIT |
>> + (msm_dp_sdp->pb.PB2 << PARITY_BYTE_2_BIT) |
>> + (msm_dp_sdp->vsc_sdp.sdp_header.HB3) << HEADER_BYTE_3_BIT |
>> + (msm_dp_sdp->pb.PB3 << PARITY_BYTE_3_BIT));
>> + dp_write_link(catalog, MMSS_DP_GENERIC0_1, val);
>
> I still think that this is not the way to do it. Could you please
> extract the function that takes struct dp_sdp_header, calculates
> padding and writes resulting data to the hardware? This way we can
> reuse it later for all the dp_audio stuff.
>
hmmm ... dp_utils_pack_sdp_header() does that you are asking for right?
OR are you asking for another function like:
1) rename dp_utils_pack_sdp_header() to dp_utils_calc_sdp_parity()
2) dp_utils_pack_sdp() takes two u32 to pack the header and parity
together and we move the << HEADER_BYTE_xx | part to it
dp_catalog_panel_send_vsc_sdp() just uses these two u32 to write the
headers.
>> +
>> + val = ((msm_dp_sdp->vsc_sdp.db[16]) | (msm_dp_sdp->vsc_sdp.db[17] << 8) |
>> + (msm_dp_sdp->vsc_sdp.db[18] << 16));
>> + dp_write_link(catalog, MMSS_DP_GENERIC0_6, val);
>
> Shouldn't we write full dp_sdp data, including all zeroes? Here you
> assume that there is no other data in dp_sdp and also that nobody
> wrote anything senseless to those registers.
>
As per documentation, it says db[0] to db[15] are reserved so I thought
its better not to touch/use them and start writing for 16 onwards.
1592 * VSC SDP Payload for Pixel Encoding/Colorimetry Format
1593 * db[0] - db[15]: Reserved
1594 * db[16]: Pixel Encoding and Colorimetry Formats
1595 * db[17]: Dynamic Range and Component Bit Depth
1596 * db[18]: Content Type
1597 * db[19] - db[31]: Reserved
1598 */
>> +}
>> +
>> +static void dp_catalog_panel_update_sdp(struct dp_catalog *dp_catalog)
>> +{
>> + struct dp_catalog_private *catalog;
>> + u32 hw_revision;
>> +
>> + catalog = container_of(dp_catalog, struct dp_catalog_private, dp_catalog);
>> +
>> + hw_revision = dp_catalog_hw_revision(dp_catalog);
>> + if (hw_revision < DP_HW_VERSION_1_2 && hw_revision >= DP_HW_VERSION_1_0) {
>> + dp_write_link(catalog, MMSS_DP_SDP_CFG3, 0x01);
>> + dp_write_link(catalog, MMSS_DP_SDP_CFG3, 0x00);
>> + }
>> +}
>> +
>> +void dp_catalog_panel_enable_vsc_sdp(struct dp_catalog *dp_catalog,
>> + struct msm_dp_sdp_with_parity *msm_dp_sdp)
>> +{
>> + struct dp_catalog_private *catalog;
>> + u32 cfg, cfg2, misc;
>> +
>> + if (!dp_catalog) {
>> + DRM_ERROR("invalid input\n");
>> + return;
>> + }
>> +
>> + catalog = container_of(dp_catalog, struct dp_catalog_private, dp_catalog);
>> +
>> + cfg = dp_read_link(catalog, MMSS_DP_SDP_CFG);
>> + cfg2 = dp_read_link(catalog, MMSS_DP_SDP_CFG2);
>> + misc = dp_read_link(catalog, REG_DP_MISC1_MISC0);
>> +
>> + cfg |= GEN0_SDP_EN;
>> + dp_write_link(catalog, MMSS_DP_SDP_CFG, cfg);
>> +
>> + cfg2 |= GENERIC0_SDPSIZE_VALID;
>> + dp_write_link(catalog, MMSS_DP_SDP_CFG2, cfg2);
>> +
>> + dp_catalog_panel_send_vsc_sdp(dp_catalog, msm_dp_sdp);
>> +
>> + /* indicates presence of VSC (BIT(6) of MISC1) */
>> + misc |= DP_MISC1_VSC_SDP;
>> +
>> + drm_dbg_dp(catalog->drm_dev, "vsc sdp enable=1\n");
>> +
>> + pr_debug("misc settings = 0x%x\n", misc);
>> + dp_write_link(catalog, REG_DP_MISC1_MISC0, misc);
>> +
>> + dp_catalog_panel_update_sdp(dp_catalog);
>> +}
>> +
>> +void dp_catalog_panel_disable_vsc_sdp(struct dp_catalog *dp_catalog)
>> +{
>> + struct dp_catalog_private *catalog;
>> + u32 cfg, cfg2, misc;
>> +
>> + if (!dp_catalog) {
>> + DRM_ERROR("invalid input\n");
>> + return;
>> + }
>> +
>> + catalog = container_of(dp_catalog, struct dp_catalog_private, dp_catalog);
>> +
>> + cfg = dp_read_link(catalog, MMSS_DP_SDP_CFG);
>> + cfg2 = dp_read_link(catalog, MMSS_DP_SDP_CFG2);
>> + misc = dp_read_link(catalog, REG_DP_MISC1_MISC0);
>> +
>> + cfg &= ~GEN0_SDP_EN;
>> + dp_write_link(catalog, MMSS_DP_SDP_CFG, cfg);
>> +
>> + cfg2 &= ~GENERIC0_SDPSIZE_VALID;
>> + dp_write_link(catalog, MMSS_DP_SDP_CFG2, cfg2);
>> +
>> + /* switch back to MSA */
>> + misc &= ~DP_MISC1_VSC_SDP;
>> +
>> + drm_dbg_dp(catalog->drm_dev, "vsc sdp enable=0\n");
>> +
>> + pr_debug("misc settings = 0x%x\n", misc);
>> + dp_write_link(catalog, REG_DP_MISC1_MISC0, misc);
>> +
>> + dp_catalog_panel_update_sdp(dp_catalog);
>> +}
>> +
>> void dp_catalog_panel_tpg_enable(struct dp_catalog *dp_catalog,
>> struct drm_display_mode *drm_mode)
>> {
>> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
>> index 6cb5e2a243de2..4bf08c27a9bf3 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_catalog.h
>> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
>> @@ -9,6 +9,7 @@
>> #include <drm/drm_modes.h>
>>
>> #include "dp_parser.h"
>> +#include "dp_utils.h"
>> #include "disp/msm_disp_snapshot.h"
>>
>> /* interrupts */
>> @@ -30,6 +31,9 @@
>>
>> #define DP_AUX_CFG_MAX_VALUE_CNT 3
>>
>> +#define DP_HW_VERSION_1_0 0x10000000
>> +#define DP_HW_VERSION_1_2 0x10020000
>> +
>> /* PHY AUX config registers */
>> enum dp_phy_aux_config_type {
>> PHY_AUX_CFG0,
>> @@ -124,6 +128,9 @@ u32 dp_catalog_ctrl_read_phy_pattern(struct dp_catalog *dp_catalog);
>>
>> /* DP Panel APIs */
>> int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog);
>> +void dp_catalog_panel_enable_vsc_sdp(struct dp_catalog *dp_catalog,
>> + struct msm_dp_sdp_with_parity *msm_dp_sdp);
>> +void dp_catalog_panel_disable_vsc_sdp(struct dp_catalog *dp_catalog);
>> void dp_catalog_dump_regs(struct dp_catalog *dp_catalog);
>> void dp_catalog_panel_tpg_enable(struct dp_catalog *dp_catalog,
>> struct drm_display_mode *drm_mode);
>> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
>> index 209cf2a35642f..beef86b1aaf81 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
>> @@ -1952,6 +1952,8 @@ int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl)
>> dp_io = &ctrl->parser->io;
>> phy = dp_io->phy;
>>
>> + dp_catalog_panel_disable_vsc_sdp(ctrl->catalog);
>> +
>> /* set dongle to D3 (power off) mode */
>> dp_link_psm_config(ctrl->link, &ctrl->panel->link_info, true);
>>
>> @@ -2026,6 +2028,8 @@ int dp_ctrl_off(struct dp_ctrl *dp_ctrl)
>> dp_io = &ctrl->parser->io;
>> phy = dp_io->phy;
>>
>> + dp_catalog_panel_disable_vsc_sdp(ctrl->catalog);
>> +
>> dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
>>
>> dp_catalog_ctrl_reset(ctrl->catalog);
>> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
>> index db1942794f1a4..18420a7ba4ab3 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_panel.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_panel.c
>> @@ -4,6 +4,7 @@
>> */
>>
>> #include "dp_panel.h"
>> +#include "dp_utils.h"
>>
>> #include <drm/drm_connector.h>
>> #include <drm/drm_edid.h>
>> @@ -281,6 +282,56 @@ void dp_panel_tpg_config(struct dp_panel *dp_panel, bool enable)
>> dp_catalog_panel_tpg_enable(catalog, &panel->dp_panel.dp_mode.drm_mode);
>> }
>>
>> +static int dp_panel_setup_vsc_sdp_yuv_420(struct dp_panel *dp_panel)
>> +{
>> + struct dp_catalog *catalog;
>> + struct dp_panel_private *panel;
>> + struct dp_display_mode *dp_mode;
>> + struct drm_dp_vsc_sdp vsc_sdp_data;
>> + struct msm_dp_sdp_with_parity msm_dp_sdp;
>> + ssize_t len;
>> + int rc = 0;
>> +
>> + if (!dp_panel) {
>> + DRM_ERROR("invalid input\n");
>> + rc = -EINVAL;
>> + return rc;
>> + }
>> +
>> + panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
>> + catalog = panel->catalog;
>> + dp_mode = &dp_panel->dp_mode;
>> +
>> + memset(&vsc_sdp_data, 0, sizeof(vsc_sdp_data));
>> +
>> + /* VSC SDP header as per table 2-118 of DP 1.4 specification */
>> + vsc_sdp_data.sdp_type = DP_SDP_VSC;
>> + vsc_sdp_data.revision = 0x05;
>> + vsc_sdp_data.length = 0x13;
>> +
>> + /* VSC SDP Payload for DB16 */
>> + vsc_sdp_data.pixelformat = DP_PIXELFORMAT_YUV420;
>> + vsc_sdp_data.colorimetry = DP_COLORIMETRY_DEFAULT;
>> +
>> + /* VSC SDP Payload for DB17 */
>> + vsc_sdp_data.bpc = dp_mode->bpp / 3;
>> + vsc_sdp_data.dynamic_range = DP_DYNAMIC_RANGE_CTA;
>> +
>> + /* VSC SDP Payload for DB18 */
>> + vsc_sdp_data.content_type = DP_CONTENT_TYPE_GRAPHICS;
>> +
>> + // rc = dp_utils_pack_vsc_sdp(&vsc_sdp_data, &sdp_header, gen_buffer, buff_size);
>> + len = dp_utils_pack_vsc_sdp(&vsc_sdp_data, &msm_dp_sdp);
>> + if (len < 0) {
>> + DRM_ERROR("unable to pack vsc sdp\n");
>> + return len;
>> + }
>> +
>> + dp_catalog_panel_enable_vsc_sdp(catalog, &msm_dp_sdp);
>> +
>> + return rc;
>> +}
>> +
>> void dp_panel_dump_regs(struct dp_panel *dp_panel)
>> {
>> struct dp_catalog *catalog;
>> @@ -344,6 +395,10 @@ int dp_panel_timing_cfg(struct dp_panel *dp_panel)
>> catalog->dp_active = data;
>>
>> dp_catalog_panel_timing_cfg(catalog);
>> +
>> + if (dp_panel->dp_mode.out_fmt_is_yuv_420)
>> + dp_panel_setup_vsc_sdp_yuv_420(dp_panel);
>> +
>> panel->panel_on = true;
>>
>> return 0;
>> diff --git a/drivers/gpu/drm/msm/dp/dp_reg.h b/drivers/gpu/drm/msm/dp/dp_reg.h
>> index ea85a691e72b5..2983756c125cd 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_reg.h
>> +++ b/drivers/gpu/drm/msm/dp/dp_reg.h
>> @@ -142,6 +142,7 @@
>> #define DP_MISC0_SYNCHRONOUS_CLK (0x00000001)
>> #define DP_MISC0_COLORIMETRY_CFG_SHIFT (0x00000001)
>> #define DP_MISC0_TEST_BITS_DEPTH_SHIFT (0x00000005)
>> +#define DP_MISC1_VSC_SDP (0x00004000)
>>
>> #define REG_DP_VALID_BOUNDARY (0x00000030)
>> #define REG_DP_VALID_BOUNDARY_2 (0x00000034)
>> @@ -201,9 +202,11 @@
>> #define MMSS_DP_AUDIO_CTRL_RESET (0x00000214)
>>
>> #define MMSS_DP_SDP_CFG (0x00000228)
>> +#define GEN0_SDP_EN (0x00020000)
>> #define MMSS_DP_SDP_CFG2 (0x0000022C)
>> #define MMSS_DP_AUDIO_TIMESTAMP_0 (0x00000230)
>> #define MMSS_DP_AUDIO_TIMESTAMP_1 (0x00000234)
>> +#define GENERIC0_SDPSIZE_VALID (0x00010000)
>>
>> #define MMSS_DP_AUDIO_STREAM_0 (0x00000240)
>> #define MMSS_DP_AUDIO_STREAM_1 (0x00000244)
>> diff --git a/drivers/gpu/drm/msm/dp/dp_utils.c b/drivers/gpu/drm/msm/dp/dp_utils.c
>> index 3a44fe738c004..81601f3c414fc 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_utils.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_utils.c
>> @@ -4,6 +4,7 @@
>> */
>>
>> #include <linux/types.h>
>> +#include <drm/drm_print.h>
>>
>> #include "dp_utils.h"
>>
>> @@ -71,3 +72,50 @@ u8 dp_utils_calculate_parity(u32 data)
>>
>> return parity_byte;
>> }
>> +
>> +ssize_t dp_utils_pack_sdp_header(struct dp_sdp_header *sdp_header, struct msm_dp_vsc_sdp_parity *pb,
>> + size_t size)
>> +{
>> + u8 header;
>> +
>> + size_t length = sizeof(struct msm_dp_vsc_sdp_parity);
>> +
>> + if (size < length)
>> + return -ENOSPC;
>> +
>> + memset(pb, 0, size);
>> +
>> + header = sdp_header->HB0;
>> + pb->PB0 = dp_utils_calculate_parity(header);
>> +
>> + header = sdp_header->HB1;
>> + pb->PB1 = dp_utils_calculate_parity(header);
>> +
>> + header = sdp_header->HB2;
>> + pb->PB2 = dp_utils_calculate_parity(header);
>> +
>> + header = sdp_header->HB3;
>> + pb->PB3 = dp_utils_calculate_parity(header);
>> +
>> + return length;
>> +}
>> +
>> +ssize_t dp_utils_pack_vsc_sdp(struct drm_dp_vsc_sdp *vsc, struct msm_dp_sdp_with_parity *msm_dp_sdp)
>> +{
>> + ssize_t len;
>> +
>> + len = drm_dp_vsc_sdp_pack(vsc, &msm_dp_sdp->vsc_sdp, sizeof(msm_dp_sdp->vsc_sdp));
>> + if (len < 0) {
>> + DRM_ERROR("unable to pack vsc sdp\n");
>> + return len;
>> + }
>> +
>> + len = dp_utils_pack_sdp_header(&msm_dp_sdp->vsc_sdp.sdp_header, &msm_dp_sdp->pb,
>> + sizeof(msm_dp_sdp->pb));
>> + if (len < 0) {
>> + DRM_ERROR("unable to pack sdp header\n");
>> + return len;
>> + }
>> +
>> + return len;
>> +}
>> diff --git a/drivers/gpu/drm/msm/dp/dp_utils.h b/drivers/gpu/drm/msm/dp/dp_utils.h
>> index 5a505cbf3432b..6946bc51cae97 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_utils.h
>> +++ b/drivers/gpu/drm/msm/dp/dp_utils.h
>> @@ -6,6 +6,8 @@
>> #ifndef _DP_UTILS_H_
>> #define _DP_UTILS_H_
>>
>> +#include <drm/display/drm_dp_helper.h>
>> +
>> #define HEADER_BYTE_0_BIT 0
>> #define PARITY_BYTE_0_BIT 8
>> #define HEADER_BYTE_1_BIT 16
>> @@ -15,8 +17,24 @@
>> #define HEADER_BYTE_3_BIT 16
>> #define PARITY_BYTE_3_BIT 24
>>
>> +struct msm_dp_vsc_sdp_parity {
>> + u8 PB0;
>> + u8 PB1;
>> + u8 PB2;
>> + u8 PB3;
>> +} __packed;
>> +
>> +struct msm_dp_sdp_with_parity {
>> + struct dp_sdp vsc_sdp;
>> + struct msm_dp_vsc_sdp_parity pb;
>> +};
>> +
>> u8 dp_utils_get_g0_value(u8 data);
>> u8 dp_utils_get_g1_value(u8 data);
>> u8 dp_utils_calculate_parity(u32 data);
>> +ssize_t dp_utils_pack_sdp_header(struct dp_sdp_header *sdp_header, struct msm_dp_vsc_sdp_parity *pb,
>> + size_t size);
>> +ssize_t dp_utils_pack_vsc_sdp(struct drm_dp_vsc_sdp *vsc,
>> + struct msm_dp_sdp_with_parity *msm_dp_sdp);
>>
>> #endif /* _DP_UTILS_H_ */
>> --
>> 2.39.2
>>
>
>
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