feat(imx8mn): add workaround for errata ERR050362

Port the workaround from the downstream imx-atf [1]:

| commit 1990081264f40822d1564f4562f05bbbc0c2941b
| Author: Ji Luo <ji.luo@nxp.com>
| Date:   Thu May 20 16:26:55 2021 +0800
|
|     MA-19071 imx8mn: workaround for errata ERR050362
|
|     Configure the force_incr programmable bit in GPV_5 of PL301_display,
|     which fixes partial write issue. This workaround was done in MCU FW
|     before, move it to TF-A now as MCU should not touch secure world.
|
|     Change-Id: I2e5bbc764640afeab6ac2f4b202939b59bd3b3f2
|     Signed-off-by: Ji Luo <ji.luo@nxp.com>

[1] https://github.com/nxp-imx/imx-atf.git

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Change-Id: Iaff5f1faa143204d64c075b288f8dd13eb2902d8
diff --git a/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c b/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c
index 9117cf0..2308dfc 100644
--- a/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c
+++ b/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c
@@ -139,6 +139,13 @@
 
 	imx_csu_init(csu_cfg);
 
+	/*
+	 * Configure the force_incr programmable bit in GPV_5 of PL301_display, which fixes
+	 * partial write issue. The AXI2AHB bridge is used for masters that access the TCM
+	 * through system bus. Please refer to errata ERR050362 for more information.
+	 */
+	mmio_setbits_32((GPV5_BASE_ADDR + FORCE_INCR_OFFSET), FORCE_INCR_BIT_MASK);
+
 	/* config the ocram memory range for secure access */
 	mmio_write_32(IMX_IOMUX_GPR_BASE + 0x2c, 0x4c1);
 	val = mmio_read_32(IMX_IOMUX_GPR_BASE + 0x2c);