drm/bridge: cdns-dsi: Fix the clock variable for mode_valid()

commit 132bdce upstream.

The crtc_* mode parameters do not get generated (duplicated in this
case) from the regular parameters before the mode validation phase
begins.

The rest of the code conditionally uses the crtc_* parameters only
during the bridge enable phase, but sticks to the regular parameters
for mode validation. In this singular instance, however, the driver
tries to use the crtc_clock parameter even during the mode validation,
causing the validation to fail.

Allow the D-Phy config checks to use mode->clock instead of
mode->crtc_clock during mode_valid checks, like everywhere else in the
driver.

Fixes: fced5a3 ("drm/bridge: cdns: Convert to phy framework")
Cc: [email protected]
Reviewed-by: Tomi Valkeinen <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Tested-by: Tomi Valkeinen <[email protected]>
Signed-off-by: Aradhya Bhatia <[email protected]>
Signed-off-by: Aradhya Bhatia <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Aradhya Bhatia

drivers/gpu/drm/bridge/cdns-dsi.c

@@ -609,13 +609,14 @@ static int cdns_dsi_check_conf(struct cdns_dsi *dsi,
 	struct phy_configure_opts_mipi_dphy *phy_cfg = &output->phy_opts.mipi_dphy;
 	unsigned long dsi_hss_hsa_hse_hbp;
 	unsigned int nlanes = output->dev->lanes;
+	int mode_clock = (mode_valid_check ? mode->clock : mode->crtc_clock);
 	int ret;
 
 	ret = cdns_dsi_mode2cfg(dsi, mode, dsi_cfg, mode_valid_check);
 	if (ret)
 		return ret;
 
-	phy_mipi_dphy_get_default_config(mode->crtc_clock * 1000,
+	phy_mipi_dphy_get_default_config(mode_clock * 1000,
 					 mipi_dsi_pixel_format_to_bpp(output->dev->format),
 					 nlanes, phy_cfg);