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Date: Wed, 3 Apr 2024 13:51:04 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Jun Nie <jun.nie@...aro.org>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>,
Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>,
David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Jessica Zhang <quic_jesszhan@...cinc.com>, Vinod Koul <vkoul@...nel.org>,
linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Jonathan Marek <jonathan@...ek.ca>
Subject: Re: [PATCH v3 6/6] drm/msm/dsi: support DSC configurations with
slice_per_pkt > 1
On Wed, 3 Apr 2024 at 12:11, Jun Nie <jun.nie@...aro.org> wrote:
>
> From: Jonathan Marek <jonathan@...ek.ca>
>
> Support slice_per_pkt in msm driver.
>
> Note that the removed "pkt_per_line = slice_per_intf * slice_per_pkt"
> comment is incorrect.
>
> Also trim the code to simplify the dsc reference.
>
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> Signed-off-by: Jun Nie <jun.nie@...aro.org>
> ---
> drivers/gpu/drm/msm/dsi/dsi_host.c | 35 ++++++++++++++---------------------
> 1 file changed, 14 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index b0507a42ee6a..0c6f40dbd25c 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -866,17 +866,10 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
> slice_per_intf = msm_dsc_get_slices_per_intf(dsc, hdisplay);
>
> total_bytes_per_intf = dsc->slice_chunk_size * slice_per_intf;
> - bytes_per_pkt = dsc->slice_chunk_size; /* * slice_per_pkt; */
> -
> + bytes_per_pkt = dsc->slice_chunk_size * dsc->slice_per_pkt;
Please don't mix cleanup and functional changes.
> eol_byte_num = total_bytes_per_intf % 3;
>
> - /*
> - * Typically, pkt_per_line = slice_per_intf * slice_per_pkt.
> - *
> - * Since the current driver only supports slice_per_pkt = 1,
> - * pkt_per_line will be equal to slice per intf for now.
> - */
> - pkt_per_line = slice_per_intf;
> + pkt_per_line = slice_per_intf / dsc->slice_per_pkt;
>
> if (is_cmd_mode) /* packet data type */
> reg = DSI_COMMAND_COMPRESSION_MODE_CTRL_STREAM0_DATATYPE(MIPI_DSI_DCS_LONG_WRITE);
> @@ -916,6 +909,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
> static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
> {
> struct drm_display_mode *mode = msm_host->mode;
> + struct drm_dsc_config *dsc = msm_host->dsc;
And here too. Please pull msm_host->dsc change to a separate patch.
> u32 hs_start = 0, vs_start = 0; /* take sync start as 0 */
> u32 h_total = mode->htotal;
> u32 v_total = mode->vtotal;
> @@ -947,8 +941,7 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
> hdisplay /= 2;
> }
>
> - if (msm_host->dsc) {
> - struct drm_dsc_config *dsc = msm_host->dsc;
> + if (dsc) {
> u32 bytes_per_pclk;
>
> /* update dsc params with timing params */
> @@ -988,14 +981,14 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
> else
> bytes_per_pclk = 3;
>
> - hdisplay = DIV_ROUND_UP(msm_dsc_get_bytes_per_line(msm_host->dsc), bytes_per_pclk);
> + hdisplay = DIV_ROUND_UP(msm_dsc_get_bytes_per_line(dsc), bytes_per_pclk);
>
> h_total += hdisplay;
> ha_end = ha_start + hdisplay;
> }
>
> if (msm_host->mode_flags & MIPI_DSI_MODE_VIDEO) {
> - if (msm_host->dsc)
> + if (dsc)
> dsi_update_dsc_timing(msm_host, false, mode->hdisplay);
>
> dsi_write(msm_host, REG_DSI_ACTIVE_H,
> @@ -1016,21 +1009,17 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
> DSI_ACTIVE_VSYNC_VPOS_START(vs_start) |
> DSI_ACTIVE_VSYNC_VPOS_END(vs_end));
> } else { /* command mode */
> - if (msm_host->dsc)
> + if (dsc)
> dsi_update_dsc_timing(msm_host, true, mode->hdisplay);
>
> /* image data and 1 byte write_memory_start cmd */
> - if (!msm_host->dsc)
> + if (!dsc)
> wc = hdisplay * mipi_dsi_pixel_format_to_bpp(msm_host->format) / 8 + 1;
> else
> /*
> * When DSC is enabled, WC = slice_chunk_size * slice_per_pkt + 1.
> - * Currently, the driver only supports default value of slice_per_pkt = 1
> - *
> - * TODO: Expand mipi_dsi_device struct to hold slice_per_pkt info
> - * and adjust DSC math to account for slice_per_pkt.
> */
> - wc = msm_host->dsc->slice_chunk_size + 1;
> + wc = dsc->slice_chunk_size * dsc->slice_per_pkt + 1;
>
> dsi_write(msm_host, REG_DSI_CMD_MDP_STREAM0_CTRL,
> DSI_CMD_MDP_STREAM0_CTRL_WORD_COUNT(wc) |
> @@ -1657,8 +1646,12 @@ static int dsi_host_attach(struct mipi_dsi_host *host,
> msm_host->lanes = dsi->lanes;
> msm_host->format = dsi->format;
> msm_host->mode_flags = dsi->mode_flags;
> - if (dsi->dsc)
> + if (dsi->dsc) {
> msm_host->dsc = dsi->dsc;
> + /* for backwards compatibility, assume 1 if not set */
> + if (!dsi->dsc->slice_per_pkt)
> + dsi->dsc->slice_per_pkt = 1;
> + }
>
> /* Some gpios defined in panel DT need to be controlled by host */
> ret = dsi_host_init_panel_gpios(msm_host, &dsi->dev);
>
> --
> 2.34.1
>
--
With best wishes
Dmitry
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