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2b1c6b21b5
As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Also adds support for Raspberry Pi Compute Module 3 (untested). Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
121 lines
3.8 KiB
Diff
121 lines
3.8 KiB
Diff
From 8349a032c4e1d3f9c3c5e4bb66064b6addf6f111 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 22 Jan 2016 16:03:24 +0000
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Subject: [PATCH] bcm2835-sdhost: Add debug_flags dtparam
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Bit zero disables the single-read-sectors map:
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If the default MMC driver is bcm2835-mmc:
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dtoverlay=sdhost,debug_flags=1
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If the default MMC driver is bcm2835-sdhost:
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dtoverlay=sdtweak,debug_flags=1
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(although the sdhost overlay may also work, sdtweak is
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less invasive and will work in more circumstances).
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Also revert the timeout change, just in case.
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---
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arch/arm/boot/dts/overlays/sdhost-overlay.dts | 2 ++
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arch/arm/boot/dts/overlays/sdtweak-overlay.dts | 2 ++
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drivers/mmc/host/bcm2835-sdhost.c | 26 +++++++++++++++++++++-----
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3 files changed, 25 insertions(+), 5 deletions(-)
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--- a/arch/arm/boot/dts/overlays/sdhost-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/sdhost-overlay.dts
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@@ -16,6 +16,7 @@
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frag1: __overlay__ {
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brcm,overclock-50 = <0>;
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brcm,pio-limit = <1>;
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+ brcm,debug-flags = <0>;
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status = "okay";
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};
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};
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@@ -25,5 +26,6 @@
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force_pio = <&frag1>,"brcm,force-pio?";
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pio_limit = <&frag1>,"brcm,pio-limit:0";
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debug = <&frag1>,"brcm,debug?";
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+ debug_flags = <&frag1>,"brcm,debug-flags:0";
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};
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};
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--- a/arch/arm/boot/dts/overlays/sdtweak-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/sdtweak-overlay.dts
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@@ -9,6 +9,7 @@
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frag1: __overlay__ {
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brcm,overclock-50 = <0>;
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brcm,pio-limit = <1>;
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+ brcm,debug-flags = <0>;
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};
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};
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@@ -17,5 +18,6 @@
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force_pio = <&frag1>,"brcm,force-pio?";
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pio_limit = <&frag1>,"brcm,pio-limit:0";
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debug = <&frag1>,"brcm,debug?";
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+ debug_flags = <&frag1>,"brcm,debug-flags:0";
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};
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};
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--- a/drivers/mmc/host/bcm2835-sdhost.c
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+++ b/drivers/mmc/host/bcm2835-sdhost.c
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@@ -174,6 +174,8 @@ struct bcm2835_host {
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u32 overclock; /* Current frequency if overclocked, else zero */
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u32 pio_limit; /* Maximum block count for PIO (0 = always DMA) */
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+ u32 debug_flags;
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+
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u32 sectors; /* Cached card size in sectors */
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u32 single_read_sectors[8];
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};
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@@ -682,7 +684,7 @@ static void bcm2835_sdhost_prepare_data(
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host->flush_fifo = 0;
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host->data->bytes_xfered = 0;
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- if (!host->sectors && host->mmc->card)
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+ if (!host->sectors && host->mmc->card && !(host->debug_flags & 1))
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{
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struct mmc_card *card = host->mmc->card;
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if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
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@@ -1486,8 +1488,8 @@ void bcm2835_sdhost_set_clock(struct bcm
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host->cdiv = div;
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bcm2835_sdhost_write(host, host->cdiv, SDCDIV);
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- /* Set the timeout to 250ms */
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- bcm2835_sdhost_write(host, host->mmc->actual_clock/4, SDTOUT);
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+ /* Set the timeout to 500ms */
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+ bcm2835_sdhost_write(host, host->mmc->actual_clock/2, SDTOUT);
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if (host->debug)
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pr_info("%s: clock=%d -> max_clk=%d, cdiv=%x (actual clock %d)\n",
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@@ -1606,8 +1608,16 @@ static int bcm2835_sdhost_multi_io_quirk
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host = mmc_priv(card->host);
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- if (direction == MMC_DATA_READ)
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- {
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+ if (!host->sectors) {
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+ /* csd.capacity is in weird units - convert to sectors */
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+ u32 card_sectors = (card->csd.capacity << (card->csd.read_blkbits - 9));
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+ if ((direction == MMC_DATA_READ) &&
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+ ((blk_pos + blk_size) == card_sectors))
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+ blk_size--;
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+ return blk_size;
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+ }
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+
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+ if (direction == MMC_DATA_READ) {
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int i;
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int sector;
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for (i = 0; blk_pos > (sector = host->single_read_sectors[i]); i++)
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@@ -1838,8 +1848,14 @@ static int bcm2835_sdhost_probe(struct p
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host->allow_dma = ALLOW_DMA &&
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!of_property_read_bool(node, "brcm,force-pio");
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host->debug = of_property_read_bool(node, "brcm,debug");
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+ of_property_read_u32(node,
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+ "brcm,debug-flags",
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+ &host->debug_flags);
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}
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+ if (host->debug_flags)
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+ dev_err(dev, "debug_flags=%x\n", host->debug_flags);
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+
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if (host->allow_dma) {
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if (node) {
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host->dma_chan_tx =
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