From 8d91c1e411f55d7ea91b1183a2e9f8088fb4d5be Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Tue, 15 Dec 2015 14:52:16 -0300
Subject: Linux-libre 4.3.2-gnu

---
 drivers/mmc/host/sdhci.c | 54 ++++++++++++++++++++++++++++++++++--------------
 1 file changed, 38 insertions(+), 16 deletions(-)

(limited to 'drivers/mmc/host/sdhci.c')

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index b0c915a35..fbc7efddd 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -206,8 +206,7 @@ EXPORT_SYMBOL_GPL(sdhci_reset);
 static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
 {
 	if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
-		if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
-			SDHCI_CARD_PRESENT))
+		if (!sdhci_do_get_cd(host))
 			return;
 	}
 
@@ -1156,10 +1155,13 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 	int real_div = div, clk_mul = 1;
 	u16 clk = 0;
 	unsigned long timeout;
+	bool switch_base_clk = false;
 
 	host->mmc->actual_clock = 0;
 
 	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
+	if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
+		mdelay(1);
 
 	if (clock == 0)
 		return;
@@ -1193,15 +1195,25 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 					<= clock)
 					break;
 			}
-			/*
-			 * Set Programmable Clock Mode in the Clock
-			 * Control register.
-			 */
-			clk = SDHCI_PROG_CLOCK_MODE;
-			real_div = div;
-			clk_mul = host->clk_mul;
-			div--;
-		} else {
+			if ((host->max_clk * host->clk_mul / div) <= clock) {
+				/*
+				 * Set Programmable Clock Mode in the Clock
+				 * Control register.
+				 */
+				clk = SDHCI_PROG_CLOCK_MODE;
+				real_div = div;
+				clk_mul = host->clk_mul;
+				div--;
+			} else {
+				/*
+				 * Divisor can be too small to reach clock
+				 * speed requirement. Then use the base clock.
+				 */
+				switch_base_clk = true;
+			}
+		}
+
+		if (!host->clk_mul || switch_base_clk) {
 			/* Version 3.00 divisors must be a multiple of 2. */
 			if (host->max_clk <= clock)
 				div = 1;
@@ -1214,6 +1226,9 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 			}
 			real_div = div;
 			div >>= 1;
+			if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
+				&& !div && host->max_clk <= 25000000)
+				div = 1;
 		}
 	} else {
 		/* Version 2.00 divisors must be a power of 2. */
@@ -1606,15 +1621,21 @@ static int sdhci_do_get_cd(struct sdhci_host *host)
 	if (host->flags & SDHCI_DEVICE_DEAD)
 		return 0;
 
-	/* If polling/nonremovable, assume that the card is always present. */
-	if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
-	    (host->mmc->caps & MMC_CAP_NONREMOVABLE))
+	/* If nonremovable, assume that the card is always present. */
+	if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
 		return 1;
 
-	/* Try slot gpio detect */
+	/*
+	 * Try slot gpio detect, if defined it take precedence
+	 * over build in controller functionality
+	 */
 	if (!IS_ERR_VALUE(gpio_cd))
 		return !!gpio_cd;
 
+	/* If polling, assume that the card is always present. */
+	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
+		return 1;
+
 	/* Host native card detect */
 	return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
 }
@@ -3111,7 +3132,8 @@ int sdhci_add_host(struct sdhci_host *host)
 		mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
 
 	if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
-	    !(mmc->caps & MMC_CAP_NONREMOVABLE))
+	    !(mmc->caps & MMC_CAP_NONREMOVABLE) &&
+	    IS_ERR_VALUE(mmc_gpio_get_cd(host->mmc)))
 		mmc->caps |= MMC_CAP_NEEDS_POLL;
 
 	/* If there are external regulators, get them */
-- 
cgit v1.2.3-54-g00ecf