From: Tomi Valkeinen tomi.valkeinen@ti.com
commit e2c4ed148cf3ec8669a1d90dc66966028e5fad70 upstream.
The OMAP36xx and AM/DM37x TRMs say that the maximum divider for DSS fclk (in CM_CLKSEL_DSS) is 32. Experimentation shows that this is not correct, and using divider of 32 breaks DSS with a flood or underflows and sync losts. Dividers up to 31 seem to work fine.
There is another patch to the DT files to limit the divider correctly, but as the DSS driver also needs to know the maximum divider to be able to iteratively find good rates, we also need to do the fix in the DSS driver.
Signed-off-by: Tomi Valkeinen tomi.valkeinen@ti.com Cc: Adam Ford aford173@gmail.com Cc: stable@vger.kernel.org Link: https://patchwork.freedesktop.org/patch/msgid/20191002122542.8449-1-tomi.val... Tested-by: Adam Ford aford173@gmail.com Reviewed-by: Jyri Sarha jsarha@ti.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/omapdrm/dss/dss.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/omapdrm/dss/dss.c +++ b/drivers/gpu/drm/omapdrm/dss/dss.c @@ -1100,7 +1100,7 @@ static const struct dss_features omap34x
static const struct dss_features omap3630_dss_feats = { .model = DSS_MODEL_OMAP3, - .fck_div_max = 32, + .fck_div_max = 31, .fck_freq_max = 173000000, .dss_fck_multiplier = 1, .parent_clk_name = "dpll4_ck",