From 61598093bbdd283a7edc367d900f223070ead8d2 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:43:03 +0000
Subject: [PATCH] add ax88772C AX88772C_eeprom_tools

---
 kernel/drivers/mmc/host/jz4740_mmc.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/kernel/drivers/mmc/host/jz4740_mmc.c b/kernel/drivers/mmc/host/jz4740_mmc.c
index aa3dfb9..62d0023 100644
--- a/kernel/drivers/mmc/host/jz4740_mmc.c
+++ b/kernel/drivers/mmc/host/jz4740_mmc.c
@@ -1041,6 +1041,16 @@
 	mmc->ops = &jz4740_mmc_ops;
 	if (!mmc->f_max)
 		mmc->f_max = JZ_MMC_CLK_RATE;
+
+	/*
+	 * There seems to be a problem with this driver on the JZ4760 and
+	 * JZ4760B SoCs. There, when using the maximum rate supported (50 MHz),
+	 * the communication fails with many SD cards.
+	 * Until this bug is sorted out, limit the maximum rate to 24 MHz.
+	 */
+	if (host->version == JZ_MMC_JZ4760 && mmc->f_max > JZ_MMC_CLK_RATE)
+		mmc->f_max = JZ_MMC_CLK_RATE;
+
 	mmc->f_min = mmc->f_max / 128;
 	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 

--
Gitblit v1.6.2