Re: [PATCH v2 0/5] Tegra SDHCI UHS-I support

[Jon Hunter <jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>]

Hi Lucas,

On 22/12/15 18:40, Lucas Stach wrote:
> Hi all,
> 
> this series implements UHS-I signaling for the Tegra SDHCI host,
> which mainly means putting a proper tuning sequence in place.
> 
> I've tested this on Jetson TK1 and got the following speed results,
> where mmcblk0 is the on-board eMMC and mmcblk1 is a micro SDXC card:
> 
> Without series applied:
> hdparm -t /dev/mmcblk0
>  Timing buffered disk reads:  110 MB in  3.05 seconds =  36.02 MB/sec
> hdparm -t /dev/mmcblk1
>  Timing buffered disk reads:   56 MB in  3.01 seconds =  18.63 MB/sec
>  
> With series applied:
> hdparm -t /dev/mmcblk0
>  Timing buffered disk reads:  236 MB in  3.00 seconds =  78.58 MB/sec
> hdparm -t /dev/mmcblk1
>  Timing buffered disk reads:  102 MB in  3.04 seconds =  33.51 MB/sec
> 
> Tegra 30 does support UHS-I speeds too, but currently has problems
> when lowering the card voltage, which is needed in order to switch
> to UHS-I signaling. I have some more patches to fix this, but they
> need a bit more cleanup, with them applied the gains on Tegra30 are
> similar to the results above.
> 
> For now the gains are limited to Tegra124+, with no regressions on
> Tegra30 and Tegra20.
> 
> V2 fixes some minor style problems and is rebased on top of mmc/next.
> This means it enables the same tuning logic on Tegra210 also. I
> don't have a way to test this myself, so any testing on Tegra210 much
> appreciated.

I have recently noticed that on my tegra114-dalmore-a04, SD cards are no
longer recognised on boot. It appears that the problem started after
this series was merged.

On tegra114 I see:

[    1.777006] mmc0: error -110 whilst initialising SD card

If I disable the UHS-I changes then it works again (see below). I am
guessing you don't have a tegra114 board to test on? I have not had time
to look into this further, but I am not sure if we should disable UHS-I
on tegra114 for now?

Cheers
Jon

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 83c4bf7bc16c..bc7a0847e316 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -147,10 +147,16 @@ static void tegra_sdhci_reset(struct sdhci_host
*host, u8 mask)
 	/* Advertise UHS modes as supported by host */
 	if (soc_data->nvquirks & NVQUIRK_ENABLE_SDR50)
 		misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDR50;
+	else
+		misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_SDR50;
 	if (soc_data->nvquirks & NVQUIRK_ENABLE_DDR50)
 		misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_DDR50;
+	else
+		misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_DDR50;
 	if (soc_data->nvquirks & NVQUIRK_ENABLE_SDR104)
 		misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDR104;
+	else
+		misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_SDR104;
 	sdhci_writel(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);

 	clk_ctrl = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL);
@@ -315,6 +321,32 @@ static const struct sdhci_ops tegra114_sdhci_ops = {
 	.write_w    = tegra_sdhci_writew,
 	.write_l    = tegra_sdhci_writel,
 	.set_clock  = tegra_sdhci_set_clock,
+	.set_bus_width = sdhci_set_bus_width,
+	.reset      = tegra_sdhci_reset,
+	.set_uhs_signaling = sdhci_set_uhs_signaling,
+	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
+};
+
+static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
+	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
+		  SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
+		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
+		  SDHCI_QUIRK_NO_HISPD_BIT |
+		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
+		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
+	.ops  = &tegra114_sdhci_ops,
+};
+
+static const struct sdhci_tegra_soc_data soc_data_tegra114 = {
+	.pdata = &sdhci_tegra114_pdata,
+};
+
+static const struct sdhci_ops tegra124_sdhci_ops = {
+	.get_ro     = tegra_sdhci_get_ro,
+	.read_w     = tegra_sdhci_readw,
+	.write_w    = tegra_sdhci_writew,
+	.write_l    = tegra_sdhci_writel,
+	.set_clock  = tegra_sdhci_set_clock,
 	.set_bus_width = tegra_sdhci_set_bus_width,
 	.reset      = tegra_sdhci_reset,
 	.platform_execute_tuning = tegra_sdhci_execute_tuning,
@@ -322,7 +354,7 @@ static const struct sdhci_ops tegra114_sdhci_ops = {
 	.get_max_clock = tegra_sdhci_get_max_clock,
 };

-static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
+static const struct sdhci_pltfm_data sdhci_tegra124_pdata = {
 	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
 		  SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
 		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
@@ -330,11 +362,11 @@ static const struct sdhci_pltfm_data
sdhci_tegra114_pdata = {
 		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
 		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
 	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
-	.ops  = &tegra114_sdhci_ops,
+	.ops  = &tegra124_sdhci_ops,