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SubjectRe: [PATCH v2 10/11] drm/msm/dsi: Add support for DSC configuration
On 15-10-21, 02:18, Dmitry Baryshkov wrote:
> On 07/10/2021 10:08, Vinod Koul wrote:
> > When DSC is enabled, we need to configure DSI registers accordingly and
> > configure the respective stream compression registers.
> >
> > Add support to calculate the register setting based on DSC params and
> > timing information and configure these registers.
> >
> > Signed-off-by: Vinod Koul <vkoul@kernel.org>
> > ---
> > drivers/gpu/drm/msm/dsi/dsi.xml.h | 10 +++
> > drivers/gpu/drm/msm/dsi/dsi_host.c | 123 ++++++++++++++++++++++++++++-
> > 2 files changed, 132 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/msm/dsi/dsi.xml.h b/drivers/gpu/drm/msm/dsi/dsi.xml.h
> > index 49b551ad1bff..c1c85df58c4b 100644
> > --- a/drivers/gpu/drm/msm/dsi/dsi.xml.h
> > +++ b/drivers/gpu/drm/msm/dsi/dsi.xml.h
> > @@ -706,4 +706,14 @@ static inline uint32_t DSI_VERSION_MAJOR(uint32_t val)
> > #define REG_DSI_CPHY_MODE_CTRL 0x000002d4
> > +#define REG_DSI_VIDEO_COMPRESSION_MODE_CTRL 0x0000029c
> > +
> > +#define REG_DSI_VIDEO_COMPRESSION_MODE_CTRL2 0x000002a0
> > +
> > +#define REG_DSI_COMMAND_COMPRESSION_MODE_CTRL 0x000002a4
> > +
> > +#define REG_DSI_COMMAND_COMPRESSION_MODE_CTRL2 0x000002a8
> > +
> > +#define REG_DSI_COMMAND_COMPRESSION_MODE_CTRL3 0x000002ac
> > +
> > #endif /* DSI_XML */
> > diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> > index ba24458c2e38..86e36a3e97b6 100644
> > --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> > +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> > @@ -946,6 +946,26 @@ static void dsi_ctrl_config(struct msm_dsi_host *msm_host, bool enable,
> > dsi_write(msm_host, REG_DSI_CPHY_MODE_CTRL, BIT(0));
> > }
> > +static int dsi_dsc_update_pic_dim(struct msm_display_dsc_config *dsc,
> > + int pic_width, int pic_height)
> > +{
> > + if (!dsc || !pic_width || !pic_height) {
> > + pr_err("DSI: invalid input: pic_width: %d pic_height: %d\n", pic_width, pic_height);
> > + return -EINVAL;
> > + }
> > +
> > + if ((pic_width % dsc->drm->slice_width) || (pic_height % dsc->drm->slice_height)) {
> > + pr_err("DSI: pic_dim %dx%d has to be multiple of slice %dx%d\n",
> > + pic_width, pic_height, dsc->drm->slice_width, dsc->drm->slice_height);
> > + return -EINVAL;
> > + }
>
> This should go to the mode_valid() callback for the dsi_bridge.

Done added a new callback for dsi_bridge to check the mode valid if DSC
is enabled

>
> > +
> > + dsc->drm->pic_width = pic_width;
> > + dsc->drm->pic_height = pic_height;
> > +
> > + return 0;
> > +}
> > +
> > static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
> > {
> > struct drm_display_mode *mode = msm_host->mode;
> > @@ -978,7 +998,72 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
> > hdisplay /= 2;
> > }
> > + if (msm_host->dsc) {
> > + struct msm_display_dsc_config *dsc = msm_host->dsc;
> > +
> > + /* update dsc params with timing params */
> > + dsi_dsc_update_pic_dim(dsc, mode->hdisplay, mode->vdisplay);
> > + DBG("Mode Width- %d x Height %d\n", dsc->drm->pic_width, dsc->drm->pic_height);
> > +
> > + /* we do the calculations for dsc parameters here so that
> > + * panel can use these parameters
> > + */
> > + dsi_populate_dsc_params(dsc);
> > +
> > + /* Divide the display by 3 but keep back/font porch and
> > + * pulse width same
> > + */
> > + h_total -= hdisplay;
> > + hdisplay /= 3;
> > + h_total += hdisplay;
> > + ha_end = ha_start + hdisplay;
> > + }
> > +
> > if (msm_host->mode_flags & MIPI_DSI_MODE_VIDEO) {
> > + if (msm_host->dsc) {
> > + struct msm_display_dsc_config *dsc = msm_host->dsc;
> > + u32 reg, intf_width, slice_per_intf;
> > + u32 total_bytes_per_intf;
> > +
> > + /* first calculate dsc parameters and then program
> > + * compress mode registers
> > + */
> > + intf_width = hdisplay;
> > + slice_per_intf = DIV_ROUND_UP(intf_width, dsc->drm->slice_width);
> > +
> > + /* If slice_count > slice_per_intf, then use 1
> > + * This can happen during partial update
> > + */
> > + dsc->drm->slice_count = 1;
>
> Is the if() missing here? The indentpation and the comment seems unclear
> about that.

yes, fixed that

--
~Vinod

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