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When the bandwidth is low for ISI, the hurry level priority could be used to avoid FIFO overflow. The NXP downstream ATF/Linux Kernel sets the hurry level as 7. Signed-off-by: Peng Fan --- V1: If anyone has setup to help test, that would be appreciated. drivers/soc/imx/imx8m-blk-ctrl.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/soc/imx/imx8m-blk-ctrl.c b/drivers/soc/imx/imx8m-blk-ctrl.c index 7c4045068804..eb13829e5dc1 100644 --- a/drivers/soc/imx/imx8m-blk-ctrl.c +++ b/drivers/soc/imx/imx8m-blk-ctrl.c @@ -690,6 +690,10 @@ static const struct imx8m_blk_ctrl_data imx8mn_disp_blk_ctl_dev_data = { #define LCDIF_ARCACHE_CTRL 0x4c #define LCDIF_1_RD_HURRY GENMASK(15, 13) #define LCDIF_0_RD_HURRY GENMASK(12, 10) +#define ISI_CACHE_CTRL 0x50 +#define ISI_V_WR_HURRY GENMASK(28, 26) +#define ISI_U_WR_HURRY GENMASK(25, 23) +#define ISI_Y_WR_HURRY GENMASK(22, 20) static int imx8mp_media_power_notifier(struct notifier_block *nb, unsigned long action, void *data) @@ -720,6 +724,15 @@ static int imx8mp_media_power_notifier(struct notifier_block *nb, regmap_set_bits(bc->regmap, LCDIF_ARCACHE_CTRL, FIELD_PREP(LCDIF_1_RD_HURRY, 7) | FIELD_PREP(LCDIF_0_RD_HURRY, 7)); + + /* + * Set panic write hurry level for ISI interfaces to + * maximum priority to avoid bandwidth issue. + */ + regmap_set_bits(bc->regmap, ISI_CACHE_CTRL, + FIELD_PREP(ISI_V_WR_HURRY, 7) | + FIELD_PREP(ISI_U_WR_HURRY, 7) | + FIELD_PREP(ISI_Y_WR_HURRY, 7)); } return NOTIFY_OK;