Re: [PATCH v3 35/56] drm/omap: dsi: implement check timings

Laurent Pinchart
2020-11-09T10:48:03Z

Hi Tomi and Sebastian,

Thank you for the patch.

On Thu, Nov 05, 2020 at 02:03:12PM +0200, Tomi Valkeinen wrote:
> From: Sebastian Reichel <sebastian.reichel@collabora.com>
>
> Implement check timings, which will check if its possible to

s/its/it's/

> configure the clocks for the provided mode using the same code
> as the set_config() hook.
>
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
> ---
> drivers/gpu/drm/omapdrm/dss/dsi.c | 70 +++++++++++++++++++------------
> 1 file changed, 44 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
> index a1a867a7d91d..f643321434e9 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -280,6 +280,11 @@ struct dsi_isr_tables {
> struct dsi_isr_data isr_table_cio[DSI_MAX_NR_ISRS];
> };
>
> +struct dsi_lp_clock_info {
> + unsigned long lp_clk;
> + u16 lp_clk_div;
> +};
> +
> struct dsi_clk_calc_ctx {
> struct dsi_data *dsi;
> struct dss_pll *pll;
> @@ -294,16 +299,12 @@ struct dsi_clk_calc_ctx {
>
> struct dss_pll_clock_info dsi_cinfo;
> struct dispc_clock_info dispc_cinfo;
> + struct dsi_lp_clock_info user_lp_cinfo;

Any reason for the user_ prefix here ?

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

>
> struct videomode vm;
> struct omap_dss_dsi_videomode_timings dsi_vm;
> };
>
> -struct dsi_lp_clock_info {
> - unsigned long lp_clk;
> - u16 lp_clk_div;
> -};
> -
> struct dsi_module_id_data {
> u32 address;
> int id;
> @@ -4789,44 +4790,55 @@ static bool dsi_is_video_mode(struct omap_dss_device *dssdev)
> return (dsi->mode == OMAP_DSS_DSI_VIDEO_MODE);
> }
>
> -static int dsi_set_config(struct omap_dss_device *dssdev,
> - const struct drm_display_mode *mode)
> +static int __dsi_calc_config(struct dsi_data *dsi,
> + const struct drm_display_mode *mode,
> + struct dsi_clk_calc_ctx *ctx)
> {
> - struct dsi_data *dsi = to_dsi_data(dssdev);
> - struct dsi_clk_calc_ctx ctx;
> - struct videomode vm;
> struct omap_dss_dsi_config cfg = dsi->config;
> + struct videomode vm;
> bool ok;
> int r;
>
> drm_display_mode_to_videomode(mode, &vm);
> - cfg.vm = &vm;
> -
> - mutex_lock(&dsi->lock);
>
> + cfg.vm = &vm;
> cfg.mode = dsi->mode;
> cfg.pixel_format = dsi->pix_fmt;
>
> if (dsi->mode == OMAP_DSS_DSI_VIDEO_MODE)
> - ok = dsi_vm_calc(dsi, &cfg, &ctx);
> + ok = dsi_vm_calc(dsi, &cfg, ctx);
> else
> - ok = dsi_cm_calc(dsi, &cfg, &ctx);
> + ok = dsi_cm_calc(dsi, &cfg, ctx);
>
> - if (!ok) {
> - DSSERR("failed to find suitable DSI clock settings\n");
> - r = -EINVAL;
> - goto err;
> - }
> + if (!ok)
> + return -EINVAL;
> +
> + dsi_pll_calc_dsi_fck(dsi, &ctx->dsi_cinfo);
>
> - dsi_pll_calc_dsi_fck(dsi, &ctx.dsi_cinfo);
> + r = dsi_lp_clock_calc(ctx->dsi_cinfo.clkout[HSDIV_DSI],
> + cfg.lp_clk_min, cfg.lp_clk_max, &ctx->user_lp_cinfo);
> + if (r)
> + return r;
> +
> + return 0;
> +}
>
> - r = dsi_lp_clock_calc(ctx.dsi_cinfo.clkout[HSDIV_DSI],
> - cfg.lp_clk_min, cfg.lp_clk_max, &dsi->user_lp_cinfo);
> +static int dsi_set_config(struct omap_dss_device *dssdev,
> + const struct drm_display_mode *mode)
> +{
> + struct dsi_data *dsi = to_dsi_data(dssdev);
> + struct dsi_clk_calc_ctx ctx;
> + int r;
> +
> + mutex_lock(&dsi->lock);
> +
> + r = __dsi_calc_config(dsi, mode, &ctx);
> if (r) {
> - DSSERR("failed to find suitable DSI LP clock settings\n");
> + DSSERR("failed to find suitable DSI clock settings\n");
> goto err;
> }
>
> + dsi->user_lp_cinfo = ctx.user_lp_cinfo;
> dsi->user_dsi_cinfo = ctx.dsi_cinfo;
> dsi->user_dispc_cinfo = ctx.dispc_cinfo;
>
> @@ -5004,11 +5016,17 @@ static void dsi_set_timings(struct omap_dss_device *dssdev,
> static int dsi_check_timings(struct omap_dss_device *dssdev,
> struct drm_display_mode *mode)
> {
> + struct dsi_data *dsi = to_dsi_data(dssdev);
> + struct dsi_clk_calc_ctx ctx;
> + int r;
> +
> DSSDBG("dsi_check_timings\n");
>
> - /* TODO */
> + mutex_lock(&dsi->lock);
> + r = __dsi_calc_config(dsi, mode, &ctx);
> + mutex_unlock(&dsi->lock);
>
> - return 0;
> + return r;
> }
>
> static int dsi_connect(struct omap_dss_device *src,

--
Regards,

Laurent Pinchart